Earlier quoted context omitted.
I suppose the argument goes: if anyone can approach that optimality, it's a company with a large fleet of repurposable drivers. Being able to dispatch to a driver in motion depends on having a suitable driver available. I'm still doubtful it can ever work, for the reasons people mentioned above. But the realistic game is that Uber becomes the new Yelp and strongarms restaurants for a share of their profit, in return…
Other way I see it working out is Uber gets so optimized that they can have a driver double dip with a delivery and passengers going on the same route.
What will passengers think about having their ride delayed? Lump it into Pool and partially rebate them?
What will keep restaurants from #&@$ing around with their notifications (e.g. ready) for a partner who they don't really like working with?
(Personally, I switched to Lyft and don't use Uber products anymore)