Honestly? Probably not then. You can make social networks that can't be censored, like GNU Social, or other decentralized apps easily. But then you have the problem you mentioned of "but who actually wants that". All the things that Urbit can do is already possible, just not easy, and each product in the same sphere has to reinvent certain subsystems to do it. Nothing is stopping you from writing Facebook-on-BitTorrent. The identity on it wouldn't be able to talk easily with Twitter-on-IPFS, but that can be fixed with elbow grease too. It's just easier to have them both powered by frameworks that provide stuff from them both, and preferably easier for your grandmother to join.

Sorry, I kinda lost the plot, didn't I? I'm not actually a believer that Urbit will do any of this, or that it's answer to the question of how to get people to switch to a decentralized platform. I just think it's a neat project to play with. But, fundementally, it doesn't do anything new, just connect several things together.