I really doubt that such a large change can come before C++ lost all its momentum. (And you could even argue that that already has happened)
I'm currently stuck at work with C++14 as we need certain compiler qualifications (for safety in automotive). Even if that proposal would be in C++26 I could maybe use it in 2035 ($current_year - 2014 + 2026). In 2035 I doubt anyone in that domain will still write C++ as Rust is already making headway.