Probably yes. It looks like separate js/hbs will be supported by ember for the foreseeable future, but it may make sense for us to make a move earlier to simplify our theme/plugin build systems.
If we do decide to deprecate hbs, we’ll go through all the normal deprecation cycle and announcements, so it won’t come as a surprise.
For themes/plugins using our standard linting config, .hbs files are already banned, and we have an automated tool to move to gjs. We’ve almost finished updating all CDCK-owned themes/plugins with that tooling.