Not good? It's pretty normal for a game to be packed at launch and to ease off after that. people at launch go as far as taking days off to grind their way up in advance, and seeing how many servers had immense queues in the first few days, Mythic wasn't so much off with the servers opened then. Servers lowering in population and some getting so low that they need to be closed are just an endemic effect of the fact that the game is no more a novelty and that for many it becomes routine, playing less hours a day and crowding the servers less, also, no game is for everyone, so it's just as normal that some people will leave.

Some software houses decide to ignore that and leave their gamers to rot in low population servers exactly to avoid the people saying "not good!", luckily Mythic isn't between them it seems, and they're taking swift action to adress the problem.

The game is still selling strong, was 4th in the NPD charts last week, so I wouldn't be worried, expecially since server transfers are most definately going to bring back many people that felt the worst of the population problem and couldn't enjoy the game fully before (I personally know more than a few that will reactivate as soon as that happens), and the holiday season is near, with 2 quite hyped new classes incoming. With polishing going well and RvR being made gradually more desirable, I'd say Mythic has still plenty chances to have to reopen servers later in the game's lifespan. I for sure fully expect to see a sizeable increase in playerbase between december and the new year (with new features incoming, a surge in sales, and people getting tired of WOTLK already, after burning trough the last ten levels, since it offers the same old soup cooked in the same old ways). If that doesn't happen, then I'll start to worry.