Who will remember these companies in 10, 20, 50 years? Most likely no one.
Who will remember companies that solve problems related to healthcare, energy, food allocation? A lot more people.
There's much to like about this list. It's ambitious in a tangible and actionable way. YCombinator realizes that if we don't want there to be a second bubble burst in Silicon Valley, we need to reach escape velocity and leave the social networks and iPhone news apps behind. That's a solid trajectory for them to take.