There are already two very successful "Fixed C"'s in wide usage: C++ & Objective-C. The remaining C usage is a mix of existing domain expertise, existing large

There are already two very successful "Fixed C"'s in wide usage: C++ & Objective-C. The remaining C usage is a mix of existing domain expertise, existing large codebases impractical to migrate to anything else (eg, Linux), or a rejection of anything more than what C provides. In all of those cases anything that's not exactly C is unlikely to motivate any changes. The users that could change to a "Fixed C" already did decades ago.