Also, how would Lyft ever buy Uber? Even if Uber and Lyft get 50/50 market share, which I think is impossible, you need to be way larger to buy out another company.
You are absolutely right that the TK/Uber combo going head-on against existing laws is what made ride hailing a reality for millions of consumers, but unless the pioneer has an air tight go-to market strategy to create and maintain dominance of the market, historically, the odds tilt strongly in favor of the second mover, third mover, nth mover (i.e. fast followers) achieving market dominance.
Facebook, the market leader was launched in 2004, MySpace in 2003 and there was Friendster in 2002 founded by Jonathan Abrams.
Zuckerberg learnt how not to run a social network from watching the mistakes of Friendster and MySpace before him.
Don't know where this 'crap pay' trope is coming from, might be different in different markets.
And Lyft got to where it is with no Kalanick. (... actually, does anyone know off the top of their heads, besides Lyft and maybe Uber employees, who founded Lyft and whether they're still in charge?)
The myth of the founder-hero who is the only person who can run a company usually has little evidence in its favor, but in this case it has explicit evidence against it. Lyft as a service is basically indistinguishable from Uber in markets where it serves both, possibly slightly better. And if Lyft acquires Uber, the two services get to stop competing on price, buying them plenty of time to figure out the self-driving tech (which, I agree, they need), and the combined company will succeed easily, no Kalanick needed.
(Also, I think "unpopular" is a pretty low-information description of why Kalanick got forced out. It could mean anything from "people on the internet don't like them" to "regulators don't like them" to "investors don't like them" to "employees don't like them," each of which have very different impacts on the company, and comparing an unpopular founder in one sense to another company's unpopular founder in another sense may not be meaningful.)