Page 10 Peer- and other Proof-of-Stake coins.
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time will tell, while I do agree Pos alone isnt the answer, a hybrid may just work, especially with projects like ETH and Decred? which are basically a pow/pos hybrid just like peercoin is, it might just make sense to more people
Decred Technical Brief 001: https://decred.org/dtb001.pdf
Decred wiki page about their hybrid PoW/PoS mechanism: https://wiki.decred.org/Introduction#Hybrid_Proof-of-Work_Proof-of-Stake