I think that the areas where it's important to switch have pretty much already switched. Science is essentially all metric.

The areas where it tends to linger are:

• Places where existing standards are in place and would be expensive to change. Like, paper size or parts used on a given class of device or something -- dishwashers have a 1/4" hex key on the underside to rotate the device if it gets stuck. Recipes.

• Things where the public has a general "sense" of something in their heads from experience, like temperature outside or miles traveled.

Entrenched standards probably aren't going to actively change purely for the purposes of metrification -- like, tripods for cameras are going to continue to be 1/4 inch diameter shafts -- but if a new standard comes out these days, it's probably based on metric. I expect that there'll be kind of a natural phasing out as existing standards naturally get replaced as some sort of new need arises.