Another and not so pretty viewpoint to why AirBnB and Lyft are becoming more popular: http://nymag.com/daily/intelligencer/2014/04/sharing-economy...
I read a good point about this somewhere: renting out an apartment on Airbnb is a good way to make money now, but the free market being what it is, that extra value will be captured by rent eventually. Landlord knows you can make $500/month renting on Airbnb? Add $500 to the rent.