My point is there should be a discussion about how to make newer toolchains available to end users. This has nothing to do about packaging within the distro and

My point is there should be a discussion about how to make newer toolchains available to end users. This has nothing to do about packaging within the distro and a non-issue since whatever "tip of tree" is for QEMU is what would get frozen as the "blessed" version and that could use whatever tip for the toolchain they needed since that's likely the same version that Debian would freeze.