Not a requirement for a GCC front-end and certainly not worth sacrificing a potentially faster path to bootstrapping the official compiler implementation. You should be worried about the ease by which various systems can bootstrap and adopt the language, which is a mostly solved problem for C/C++ but not a given for Rust itself. Some maintainers will absolutely refuse bootstrapping off of binary artifacts compiled from other systems, others won't even accept 'compiled to C' artifacts.

Keeping a viable C++ implementation as part of GCC would be the smartest decision.