All of the above is probably the answer. A very basic UBI that lets people work more of a gig economy without falling through the cracks. Capitalism has an entry fee, and we'll have to cover people for it.

We'll probably start lowering retirement age as well. It'll be expensive to do, but getting people out of the work force will be needed and this will be a good way to do it.

Making college mandatory and having jobs start later for people will be another way to make it work. No more "We hire 15 year olds!" as some kind of weird brag (McDonalds, I'm looking at you).

And then, finally, 4 or 3 day work weeks, or 1/2 day work days, or maybe both.

The jobs themselves will feel far more 'gig' ish. You might sign on for a year, or a season, or something like that. Then take some time off to enjoy what you made supplemented by UBI, and then back to another job.

It'll be lots of cuts in lots of places. Conservatives will say that "That won't work" individually to all those things, but no one is saying any of those things solves the problem alone. It's a completely systemic solution that requires rethinking about a job, it's value to us as a human being, and maybe a little value on work we do for ourselves and not making someone else rich for a while.