Maybe PoB+PoS is much better! Why waste power for GPU-CPU mining, when even RasPi can be used to complete SlimCoin usage? SlimCoin, SlimWallet & SlimMiner (RasPi

)
"Why use expensive and power-hungry hardware, when even Android smartphone can be your e-Wallet & Miner?"
Actually PoS+PoB might be a good idea. I've been thinking a lot about it too! The whole code base is built off Peercoin, and we can't migrate out to a PoW only coin cos of the PoS heritage blocks.
We will have PoB generation and PoS to secure the blockchain.
We may not even have to migrate our PoB. Just tweak PoS to make it generate blocks more frequently (aka undo what slimcoin did before he got busy elsewhere) and I remember the difficulty even reached 1 at some time back then. No one would bother to PoW then!
PoS did cause a lot of trouble for us last time though, in particular it interferes with PoW. But if PoW is meant to be an afterthought this isn't a problem then.