Looking at the release date and SWG's last day of server operation; I have noticed the correlation. SWG is closing on 12/15/11 and SWTOR will ship on 12/20/11...just enough time for people to miss an MMO, but not enough to drive them to another MMORPG. Given LucasArt's involvement in the SWG shut-down (despite the "official word" from SOE, I doubt that LA had anything in mind but a December shutdown when they were "renegotiating") it is just too convenient.
Oh well, that's your conspiracy theory for a while. Enjoy