[oznathan]

FHE will probably take a while to become practical. Remember, the first schema was published only in 2009, which is very recent in cryptography standards.

Secure multi-party computation can achieve similar objectives (compute on encrypted data-sets), but is much more mature research-wise (first schema dates back to the 70s) and can be practical for large algorithms today. See http://enigma.media.mit.edu/ (disclosure - I'm one of the founders)