ARM recently mentioned working on IP that you could turn off features to increase security. Probably will eat little silicon, so could be cheap.Intel may copy.

And since it's ARM, it's at least half-open.

Cloud providers will be interested - slower cpu's = more money, plus selling the cloud as a more secure option to your data center.

And once you have a cpu that with a hardware switch can become more secure but slower, maybe there's a decent enough niche somewhere.