For instance, in a fully decentralized system, you can get rid of storage limitations by storing stuff on your computer (or on the cloud in a private form). So you can share not only pics of your pets, but also your music and movies collection.
If this results in something as easy to use as Facebook, but uncontrollable and perfectly able to host and protect media piracy / political dissidence / etc., we get darknets for dummies. This project or a variant thereof, if successful, could deeply change Internet by taking all power out of authorities and into people's hand. Whether it's a good or a bad thing is debatable, but it certainly is interesting.