Not sure about how I feel about this... I wanted this game to be the next WoW, you know... What did we do wrong?
There will be no next WoW. Ever. WoW is a fluke - the result of a confluence of technological developments, name recognition, and closure of a division in the gaming market that can never be reproduced in the MMO genre. As I've said before, even if WoW suddenly disappeared tomorrow, no single MMO will take its place (though we'd probably see a flurry of new development activity as every publisher tried to grab a piece of the pie).
That said, within the realm of non-WoW MMOs, 450k subscribers is pretty good. Whether it's enough for SWTOR specifically, I have no way of knowing.