Homomorphic encryption is a mind-blower. But I fear that we may never see it in it's fullest glory. It's going to be computationally too expensive or too impractical for reason or another. One can still hope.
Aren't ring confidential transactions (RingCT), used in some cryptocurrencies a form of homomorphic encryption which is being applied now?
There are probably more but those are the ones off the top of my head.