And I agree, we should have double xp weekends, believe me i have 8 50+ and with Cathar coming out, I plan on working a new toon, so the thought of doing everything from scratch again, can be a little daunting. I try to make it a little different each time, like, my 50 male BH lightside, well then I make a PH female darkside....so at least it's not 100% the same thing over and over again.
My problem is not with having double xp weekends, it's with having them too often, I've seen some posts in this thread looking for 2x a month even, if that was to be the case, then they should just give you the option to lvl to 50 instantly.
Now the idea of a Legacy Unlock to increase xp to double for those who have enough of a Legacy level seems like a sound and reasonable request, that way those who want to level much faster will have the option, and those who don't, will not have it shoved down their throats =P (win win)