1. The alternative's include things they can own and control. This is really important in rural or suburban areas. It's also important for a lot of businesses. 2. The alternative's are handled in a cost effective rollout manner.
Basically, the solutions need to be in the public interest with them in mind. Not sure how that factors into startup and VC thinking these days.
I would imagine that eco friendly public transit systems could cut down on emissions, cut overall costs, and cut congestion in cities. That seems like a good place to target as low hanging fruit.