This seriously reminds me of Java zealots in worst days of Java Everywhere circus.
GuixSD has done some amazing work on full-source bootstrapping systems using the linux-libre kernel: https://guix.gnu.org/en/blog/2023/the-full-source-bootstrap-...
A requirement for a rust toolchain complicates this significantly and I'm not sure if now is the right time to have rust be a hard requirement.
Others will step in, without the values and criterias that made possible to GNU/Linux to push out UNIX, and something else will seize the opportunity.
All of this will be slow, so we will have reactLike bros invent new things to speed things up like Edge Micro SSG/SSR Island Hydration Architecture and so on.