I think the future is Proof of Stake. We just need to wait for these protocols to prove themselves as secure enough. DPOS is one good example, maybe a bit too centralised but it has its benefits. Proof of work is not sustainable in the long therm. Even if we get all the energy from green resources it will be wasted energy too.
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How many times has DPOS been hacked vs POW? I would say from a practical perspective at this time they have similar security guarantees. Both are secure enough for a large network and DPOS actually handles more transactions per second so it's doing more with less.
There aren't many POS coins which would be of a particular interest for hackers. If you manage to hack Peercoin it would not be very profitable. POS is still new compared to POW and it will need some time to mature. It is always the case with new technologies.