I think the thing to consider is that every game - be it star wars, HERO, D&D, what have you - will eventually have the players on such an extreme on the XP curve that they out power the game, unless you're throwing a Darth Vader a week at them. All games have shelf lives and some handle it better than others (my group could get a WEG Star Wars game to last 5 years). It'll be interesting to see how the FFG engine handles a half decade of millage under the hood.
I agree entirely. The campaign I played in was WEG, and it ran for 7 years before my Jedi became so potent that he managed to take on the "first Sith"'s spirit... and win. He was Revan's Padawan, and by the end of the campaign was rolling something like 22D+2 on lightsaber (with powers active, but not counting the penalties to dice pool for HAVING those powers active - also counting bonuses from self-made lightsaber).