Linux

I think that Red Hat porting a Red Hat tool is likely to be remembered. Clearly the intent is to ship and migrate to the new tool (in Fedora and in RHEL) and probably to stop shipping the old tool at the same time.

I fail to see how it is going to be forgotten.

Except that it is likely to be included in future versions of Fedora:

According to the official Fedora change proposal, the rewrite expands support for both bootc and rpm-ostree based systems, whereas the original Bash version was built only for rpm-ostree. Red Hat developers have submitted a proposal to ship this new Rust version in Fedora 43. According to Phoronix, while the plan still needs a final vote from the Fedora Engineering and Steering Committee, it looks very likely to be approved. For current Fedora IoT users, the change promises to be a simple, seamless upgrade.

The rewrite seems to be in the original project, so a fork of the old codebase would have to be done that everyone switches to, for that to be possible