Basically the economy behind the currency failed. You can not fix an economy with software updates, man. Updating wallets and bitcointalk threads wont result in a flow of GPUs to buy with GPUcoins. If you are not going to revive the store (by either investing your own money, IPO or liquid magic) you might aswell just leave this coin to die and focus your efforts somewhere where you can make a difference.
+1.
The coin is alive as a coin. The problem is the business behind it. If the business can not be rebirth the coin will not revive. The only way is a new IPO, however I doubt people will trust again and invest.
A new IPO would make it a ponzi scheme (since you need to inject new money to pay the previous IPOer). It would be a schoolbook ponzi scheme