Look, the metric system (as pertaining to distance) is all in basic multiples of 10. From 10^-24 to 10^24 and everything in between, it's all multiples of 10. It's simply cleaner and has an orderly logic, which makes the imperial remnant simply look foolish compared to it.
The problem is not the domain where it really matters (science, architecture, etc.), they already use it, but the general unwashed masses are a stubborn traditionalist bunch that needs to die out while a new way of thinking is introduced gradually. This isn't a change that happens in a year or two, it's something that happens over the course of decades. It's unfortunate, but true, that the people to benefit from this will be the young ones, as we'll most likely be old and grey by the time it's done.