We should go back to real mode. Imagine all the sudden possibilities. No pesky memory barriers, no protection faults and superb integration of applications of all kind. Application could even share the same memory and the better one wins.

"If nothing is secure, everything is secure" - Lincoln

But seriously: I don't think this "feature" is a real backdoor. It is nonetheless an interesting topic.

I am more concerned about bugs and backdoors in modules like TPM/ME or other even less documented surprises. Wouldn't be the first time that happened and we can only hope, that better people find these type of vulnerability first.