Twitter probably seemed like a fake problem at its inception (post 140 characters to a personal blog from your phone), and yet it's been adopted and used daily by many, many people outside the Valley. Google's founders weren't thinking about ads when they first built their search engine, but apparently the ads they serve are considered lucrative enough by their customers to turn the company huge. (Of course there are the data privacy issues, but on a more cynical note someone's needs are being served.)
On the other hand, Better Place seemed like a useful idea. EVs presumably aren't more widely adopted because of range anxiety and charge times, so why not create a business model and technology to swap out batteries and make recharging as painless as filling up at a gas station? But Better Place is dead now and Tesla is building out its fast charger network and selling more and more cars.