The timing of it really didn't matter...if they did it right Isen would have just become the dominant server. What they messed up was that the classes were still broken, which really wasn't too shocking considering the skills were identical to the other servers, and it was too expensive.
Its why I've been saying over and over in this thread...give us a skill balance patch, and if Jainus is going to be the primary server upgrades should be heavily reduced, otherwise you simply aren't going to see any population growth when the game basically has a 200 dollar buy in on a decent weapon. Even if we get a skill balance patch...the game being over priced is reason enough for veteran players not to return, and for new players who stumble upon the game to laugh their asses off and go play something else with a higher population and that doesn't require as much money.