I've proposed a solution, similar to what you suggest, reduce subsidy at a certain point and hard fork..
But as I've said, i can implement anything, but it requires an executive decision from the CEO and owners of GPUCoin LLC. Without that I cannot make these kids of economic changes.
Ok, this is (probably) crazy.... but... what if the currency was re-issued at 1/100th the volume of this one (200 subsidy, 135M maxcoins, etc)? Is there some way current GPUC holders could convert to the new currency? I know that's a bit drastic and perhaps impossible practically but something has to be done and cutting the subsidy isn't going to be enough IMHO unless someone supports the price during the transition.
Um, hard fork doesn't mean re-issuing the currency, i just means changing the way it's mined. Any coins already generated would still be part of the same chain.
EDIT: And doing what you're suggesting, re-issuing the currency and allowing current holders to trade in to the new one completely from ground up means that the old network would die, would be forked, and someone could easily falsify millions of GPUC.