GPU coins have better scarcity, hold more value and are more decentralized. to me thats a win, win, win, and IMO they are more resistant to 51% attacks in general and they are more multipool resistant due to the fact that each rig needs a bit more special attention to maintain.
I would say this doesn't hold true to the coins with super low total coins such as Duck or 42 coin or the other coins of that nature. Scarcity in an age where you can use technology to overcome, is only synthetic and temporary. What you're seeing is the 'eventual end of a pointless coin' just come far quicker. It was inevitable.
By your argument, Litecoin shouldn't be worth anything, but it's held. Hashpower = strength, security, reliability.
Value is based on what people place it at, afterall the coin is merely a transport mechanism with no inherent worth.
The best coin in 2014~2020, WILL BE the coin that manages to fuse the best decentralization strategy, with the best marketing strategy.
The best coin will be the one(s) adopted worldwide and used as often, or more than, cash or credit transactions, or to fill niches which can't be filled by those methods. Until then, all coin technologies and projects are merely attempts to really hit the launchpad just right.
Potcoin has a niche. It needs to really take hold.