I won't deny that I will buy more gear in the future, but for all practical purposes, any tone that I can't achieve is going to be related to my failings as a player or tweaker of my own equipment. Now that I have two Line 6 modeling guitars to go along with Guitar Rig modeling software, I have the ability to mimic a warehouse (literally) of different guitars, amps, processors, etc. I know it's going to require months if not years to get a decent handle on how to make it all work well. So, the result is that my GAS should be cured for at least two or three weeks anyway :).
Editorial Note (1 June 2010) - predicting the future was not one of my strong suits, at least in the GAS department...