This not work at all, is super-unrealistic. And it grow more un-fixable as longer and bigger is the project. For example: Fix C. Or javaScript. or Angular. I

This not work at all, is super-unrealistic. And it grow more un-fixable as longer and bigger is the project. For example: Fix C. Or javaScript. or Angular. Is impossible to do it without change what them are. And when the trouble is intrinsic the only sane option left is restart. In fact, stick to old is as worse (and maybe more) then rewrite. The trouble is when rewrite not change enough to be worth it.