Not soon. The technology is replacing you now. And it's accelerating. This is a very good thing.
In a decades time the entire premise of "employment" is likey to be vastly different. Already there is more requirement for jobs than there are available job slots. Increasing population through breeding, raised retirement ages etc combined with increases in automation and AI will only decrease the available job slots over time with increasing competition for these slots.
The system in place currently is a rationing system that only grants right to spend a limited amount of money. The entire economy is based around scarcity - and money being a fictional construct is able to be made scarce quite easily.
UBI and UBI-like constructs that have been proposed will be put in place mostly to assure people's survival - failing in this regard is likely to wreck everything in the mass food riots etc that follow - and specifically so they can keep regularly buying and keep the companies alive, as if they don't sell then they die. These companies fold up and stop producing shiny things then the 1% suffer. And it saves all the redundancy and wasted resources of employing people for the sake of employment.
There is a good chance we are not alone in the universe. Given a long enough time line it's reasonable to suggest we are assured to meet. I wouldn't personally be formulating any plans that rely on this happening within your lifetime. Certainly not to fix the "economy" - To look at this realistically, we're unlikely to meet ½ way, or even on their doorstep. Currently we have largest chance of them comming to us. If they are of a technological level to cross the vast distances of space in a reasonable timeframe then it's unlikely we'll have any form of technological advancements for use as trade. "Resources" are far more abundant in space, over a wide enough area, and logical space mining techniques - which if they can traverse solar systems is trivial - will of afforded them more matter than they could hope for from off one little backwards planet. DNA sequences may be unique, but you can only trade them once. We certainly shall have little to offer them, not even "interesting conversation". The best we have to offer is significant effort in adjusting psychological and socialogical deficits in order to elevate us to a state where it would be possible to trust co-existence.
Mandatory work isn't something that's a particuarly clever concept for either the employer or the employee. For the employer this represents additional cost for no clear gain. To the employee this is unlikley to result in any measure of choice of the matter, and doing something you don't want to be doing could be labelled slavery. Regardless of compensation, there's no real choice in the matter.
Creating jobs just to be able to employ people is one of the largest problems introduced into the economy in the last few decades, and introduced ignoring it's overall effect to the economy to alleviate a lower level problem on a temporary basis(and this is now becomming insufficient, meaning it needs to be dropped entirely to save the economy at the expense of those in the useless positions or accelerated to maintain - in economies requiring constant gain this shall accellerate break point). People don't need to monitor the robots - "AI" can do that, it can watch more entities with greater attention to details and much faster reaction times and more trustable responses. This then leaves more human time for lesser monotonous tasks. Like whatever they personally would rather be doing.
Working does not make life purposeful, unless you'd define your purpose as to generally make someone else richer. Living to work is basically slavery. Slaving to do something that really doesn't need doing and was just fabricated to give you something to do could be argued as to actually be less than living without purpose.
However high the automation levels, I do not think the requirement for human labour to be eliminated entirely. The five "jobs" listed are(acutally more than five jobs, nine) are likely to still exist in a few decades time - but in a vastly different form. Almost all of it heavily augmented by technology, if not entirely provided by technology.
Rather than "employ" people, IMHO a "better" strategy is to give people everything they want. This is at least partially possible via concepts such as UBI - but space mining can potentially provide for the physical resources to do this properly within a few decades.
Everyone likes something - interests are diverse. With a wide enough pool to the population then the collective interest should extend in every direction and cover all possible fields. You don't need to pay somone to research the effects of specific magnetic pulses in spin–orbit-coupled Bose–Einstein condensates - All you need to do to get that done is find the right person and give them everything they need - You'll have to pry them out of the lab with a crowbar, not pay them because they want to find the answer more than you do, not having to worry about tomorrows food, rent etc they are free to persue. Job satisfaction is priceless, and the only reason people choose to do things they wouldn't like to do is they are actually chasing money - because they need food tomorrow, or to pay the rent etc. Eliminate that and you can have a workforce that actually wants to be there, actually doing that task - which will result in much more care, effort and attention as people strive to be the best, not the cheapest.
Anything AI or automation would struggle with is possible to solve via such a strategy.
