It's possible, historically there has been 5 years per run before the next generation of the game came out. However it's all a matter of just what more can they do with the game that they haven't rolled into 3 or 4 and isn't mod able in 2 (and 3 or 4 for that matter). I doubt any incarnation will make anyone 100% happy with it. And is why mods exist. I have a laundry list of things I didn't like about TS2 but there were far more things I did like and all but a few of the things I didn't like you could fix with a mod. I am playing TS4 demo as I type this to see if any of the few things that couldn't be modded changed in 4. I'm on the fence about buying it even at a discount.