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.
Well, part of the problem is that because coins are being produced too fast the price is lower than was originally expected and because of this investors are losing a lot of money. Converting to a new volume would not remedy that if investors have to convert their coins over as well.
The best solution will be one that ensures the investors can make money.
I believe not many miners to hold a large amount of coin to the long-term point of view to consider