Star Wars is going to do well.
How well, and how long it will do well, time will tell.
Of the comments posted here I would like to address
1) "It won't make its money back"
If the game can average 250,000 subscribers, paying the (assumed)$15 monthly that's close to $4 mill in monthly revenue. This is money that, to my knowledge, all goes directly to the company. Some mentioned the $60 price on the game client and how Bioware only sees a smal piece of that, what about the online sales direct from them? Regardless, after inital dev costs (100-300 mill if leaks are to be believed), plus advertising, plus monthly maintenance, dev staff etc. I'd say after the huge outlay of cash, they'll be in the black soon enough, unless the game blows. Heck a friend of mine who's a moderate Star Wars fan, but not an MMO fan is planning on playing, so that's a good sign right there.
2)"VS WoW"
As some have said, who cares! Yes WoW is a huge juggernaught. Yes it has 10 - 12 million players....guess what, any number of those people can play other MMOs. I myself currently play City Of Heroes (don't judge me), I know a number of gamers I play with who do, or have played WoW as well (At a time when both were subscription based, CoH has gone F2P now also). As has been said, it isn't an Either/or case, many people can afford a few extra bucks if they feel the game is worth it. I'm looking foreward to SW:TOR, and believe many will think its worth it. Some won't, of course, but that's how things work. I don't think TOR will ever be as huge as WoW is, or will "Beat WoW into submission" and, I don't see that it has to either. If your game is good enough, and your pricing is appropriate, there is plenty of the gamer pie for several MMOs to exist. Sure a few WoWers might play TOR and decide to dump WoW, some might try TOR and decide to dump it and stay with WoW, the point is, I doubt Blizzard is worried.
3) "Sure Star wars is a popular Franchise, but so is Star Trek and they ain't making big MMO dollars"
To any who say this, I ask you, "Have you played STO(Star Trek Online)?".
Short answer, a bad MMO can't be saved by a franchise.
I have. I prebought, joined the beta and was enamored by the "$295 for lifetime subscribership, if you buy now, and we throw in this in game junk also 'cause you're gulible", so $355 later (60 for the game) I was a lifetime subscriber to a game that was very cool....for the first month.
Honestly it had some quality content for missions/quests, just not many of them(Some cool missions, but when you roll a new toon, you get pretty much all the same missions from start to finish, at the same levels). I've played the game about 3 times in the last year...had I been a monthly subscriber, I'd have long since dumped it. They've also had the "pay real cash for credits to Buy additional game content" almost since the get go. Now to be fair, as said I pretty much stopped playing a few months in, going back for a day or two on the odd occasion, so there may be a lot more content I have not seen. But the point is that they wowed me at the start, and then I got bored, and if others feel that way (And were paying per month) they might not end up giving it a second chance! And let's face it, once you decide a game sucks, you aren't likely to shell out $15 to try it out to see if "it sucks less enough to be worth it".
Heck it was the bad taste left in my mouth from STO that lead me to avoid trying DCUO when it came out.
So if SW:TOR can have a quality game with decent and varied content (and my understanding is that there is a different mission arc from lvl 1 - 10 for all 8 classes)then they may have a
shot out the gate.
Just my opinions based on my incredible expertise as a guy who thinks he knows everything!