I don't think it's realistic for friendly C to replace the current C outright. At best I guess one would get -std=friendly or -Ofriendly or such. And HPC users

I don't think it's realistic for friendly C to replace the current C outright. At best I guess one would get -std=friendly or -Ofriendly or such. And HPC users could continue using tbaa, loose fp semantics etc. as before.