We have been told we are getting a multi-million server investment after 6.0 so that may help.

New players can only roll on certain servers during extremely limited windows.
A server can only hold so many people at once so that is fine. Obviously what will need to be considered is more servers.

The website 'runs out' of digital copies of the game.
That is so strange that it's fascinating. I always thought digital copies of something were unlimited.