1) We'll all need to collectively let go of our societal ideal that work is virtuous. We will need to accept that a significant portion of people have little to no productive work available to them, and that there is nothing wrong with that. It's just the natural culmination of increasing automation and societal advancement. UBI would be a necessity in this scenario.
2) We'll see an increasing number of "make work jobs" that exist solely to keep people busy, and to generate an illusion of productivity. These jobs may ultimately be government funded, although governments may obscure the source of the funding to keep the "productivity illusion" going. For example, governments may provide business grants to keep a certain number of low-wage workers employed. I suppose this essentially would be an indirect UBI program, except that we'd make people do some nominal amount of unproductive work to "prove" that they're worthy of the UBI.
I strongly suspect we'll head towards option 2.