Uber's drivers aren't really fans of them though, nor are they loyal to a single company. Uber could disappear tomorrow and all its drivers would be fine on Lyft.
This may no longer be the case, but doesn't Lyft have a stricter vetting process than Uber? It could be that some (most, none, all?) of Uber drivers may not be that happy with Lyft.
Not really. I'd be surprised if most Uber drivers weren't already at least onboarded to Lyft. About half of the drivers I see have two phones on cradles in their cars.
Did not know that. But I'm sure there are plenty of foreign startups that would pick up the slack. There's no secret sauce in Uber's tech. It would be fitting to see Uber fail due to hubris.