I remember a school teacher explaining how we [the US] were going to make the switch soon. A healthy number of years later I realized nothing happened and wondered what was going on. Many years after that I used the "MPH/KPH" button in my vehicle as a form of useless rebellion.

Inches/feet/yards are pretty decent measurements. Better than metric, in some ways. It's miles where everything goes to hell. Fahrenheit's not really worth clinging to but does seem to be a closer match than celsius to sensible differences in temperature, using whole-number degrees only, and its 0-100 range (and somewhat beyond, with either basically translating to "effing cold" or "effing hot") matches up pretty well with common air temperatures in most populated areas, which is handy. I can see resisting a change there as it's "good enough".

Being able to trivially convert volume to mass and vice-versa for anything that's mostly water is a killer feature for metric, at least when it comes to cooking, which is the main place most people actually use volume and mass measurements in their lives. Switching there seems like a no-brainer.

Really, most people are using these measurements for household work, checking the weather and setting indoor temps, cooking, and travel distances (miles are fine there since they rarely/never need to be converted to anything else for that purpose). That's about it. The only place Imperial's a clear loser there, seems to me, is the kitchen. Most people aren't doing science—and it's telling that the kitchen, where they come the closest to it, is where metric might have a real advantage.