10 years isn't true. In the last few years, we have finally seen a successor to the RAD750, the RAD5500. And it's multi core finally. But rad hard technology does move at a glacial pace and is 10-20 years behind commercial.
https://en.m.wikipedia.org/wiki/RAD5500
http://www.baesystems.com/en-us/our-company/inc-businesses/e...