If a world wide standard has been set in imperial, it's not going to change, but maybe the numbering system will change. Drive chain for example, it's still imperial, but has a new metric style numbering system. If a system is set in metric it will stay that way.
Tyres are a mix up, they were originally set in imperial, so we had 6.50x15. Then Michelin developed the radial, and they were originally fully metric, tyre and rim size....but other manufacturers started using them, so now we have the metric tyre size with imperial rim size like 185x15.