More people = more problems I am certain but this is a social network and without people it will fail. We must all make an effort to be the change that we want to see in the world.

I don't foresee a problem in the immediate future aside from higher server load, but in terms of culture, only people who believe in a new social network will be willing to join.

In 5 years however when this is a great place to be, a large number of people will join who don't respect the legacy. The departure from Digg to Reddit felt like this too, I hope that the federation aspect will ensure this is longer lived.