There's not really a need anymore, because LibClang[1] has solved the parsing problem. Historically it was really hard to write tooling (syntax highlighters, static analyzers, scripts to update build dependendencies, etc.) for C++ due to the difficulty of parsing the language. In the past several years, that has completely changed - you just call LibClang to handle the parsing for you, and work with the high-level abstractions provided by LibClang instead of munging the text yourself. There are lots of reasons to want to replace C++, but "it's hard to write a parser" is no longer a relevant one.

[1] https://clang.llvm.org/docs/Tooling.html