Hmm, this makes me wonder if there's room in the market for an app specifically targeted towards people who want to find carpool partners and coordinate schedules among carpool groups.
Lyft seems to be oriented around passengers and vehicles being commodities. This is probably the best move for general taxi service, but work carpoolers may want to either form their own group among friends, or try a couple of groups and stick with one that works for them. Maybe there's value in focusing on helping pre-existing groups coordinate schedules, with finding new groups being more of an afterthought, rather than an implied expectation of a new, anonymous driver and passenger every day.