IKEA will not be joining w53 because of a great dislike of the world settings. Instead we will be joining w54.
That is part of the reason, yes. But myself and Amer have both been inactive recently (just check my W47 tw stats, lol). I've had quite a bit more college work to be doing than I expected, and I don't want us to join a world when the leadership isn't ready/active enough to play and lead fully.
It would be on my head if we joined, and then I had to step down because I wasn't active enough, leading to the tribe's failure.
There was (as far as I know) no one on our member list choosing to join other tribes for this world. From the reaction I got, it seemed they were more annoyed by having to join another tribe because IKEA wasn't joining, but who am I to say IKEA are better than the rest?