I don't mean to be a little harsh, however plenty of games have had 64-bit native software released since 2004.
Just to name a few off the top of my head; Half-Life 2, Unreal Tournament 2004, Far Cry, Crysis, Bioshock 2, Indigo Prophecy and The Chronicles of Riddick: Escape from Butcher Bay.
I'm sorry but this should have been the goal when releasing SWTOR. However I've read nothing regarding any plans on making a 64-bit client I can only assume that they plan on doing this. As pointed out earlier in this thread 64-bit processors are the future and seeing as this game has only just been released you'd have imagined they'd be planning for future developments rather than current or past developments.
If The Chronicles of Riddick: Escape from Butcher Bay a game developed by Tigon Studios and Starbreeze Studios can be released taking advantages of 64-bit native hardware than a game developed by Bioware and Published by EA should also be able to take advantage of 'current' hardware.
Edit: Side-Note the reason I'm interested in this is because I'm a college student and I don't have the luxury of taking my desktop with me while moving back and forth between locations so I'm currently using my somewhat out of date XPS 1530 which can utilize 64-bit hardware. I had been play World of Warcraft for the past two consecutive years and the 64-bit client made a dramatic difference when processing information allowing me to run the game smoother. My FPS increased by 66-75% while even bumping up the graphics which I previously was running near low. FPS used to be 20-30 before the 64-bit client and are currently running from 35-50