This isn't a wait and see approach, this is proactively removing it
It's "we support 4 JS backends, we don't have the capacity to support 5 currently". They're not dropping bun entirely, instead bumping the minimum bun version and not supporting "bunv2" because they don't want to be beta testers.
It's "we support 4 JS backends, we don't have the capacity to support 5 currently". They're not dropping bun entirely, instead bumping the minimum bun version and not supporting "bunv2" because they don't want to be beta testers.