i think the main reason is that they want the game to be perfect and last, look at melee, the event mode look so rushed and there was alot that didnt get put into it, i think he is just trying to make sure brawl is absolutly perfect, and im sure it will be well worth the wait. They still have some work to be done, on the website it was clear that the stage builder was not yet finished as he said it may change. They could probabally release the game on Dec. 3rd but it would take away from some sales of galaxey, but now it will have so much more to the game, not to mention have a ton of replay value. Istill play melee. Brawl added a huge online, create a stage, more characters then before, more levels, co-op, and has re-made all of the previous modes to be better then before, plus added screen shots and film to the game. If melee could last 6 years, with all brawl has added i give it more then 10.
Will be well worth the wait!
Only 98 days and 50 minutes until brawl!