I am telling them to wait. The game engine/code cannot support the current client base at the moment, so inviting more people is irrelevant.
Rift will last another month or so, people are already level 50 and complaining about more content (as they did with DCUO).
Hopefully in a month the Xsyon engine/code can support 1k people logged in at once. Then we will be set. 1k clients would make an excellent Xsyon game world.