It's not so simple. There are network effects at play(if we're talking about shared trips) - and those are hard to fight against , even for large companies like Google and Apple. This is why i think, Google is entering now - because UBER and Lyft started offering shared rides(which BTW grow rapidly).
Let someone work out the kinks, then step in and make it better...
Why waste all the money on all of this regulatory squabbling... let Uber and Lyft do that, give all the free rides, lose money to make this thing legal... then when it's legal, swoop in and take over...