Well, how much can each server hold? There's probably going to be about fifty playgrounders, max. Then if they get their friends to play, still only about two hundred at most. If servers can hold a thousand or more, I don't know how much it'll matter, as long as we get a server that currently has room for three or four hundred more people.
If there is a limit on 1000 people it means that only 42.000 can register on their current servers. I think Anet plans to have a larger player-base than that.