I've repeatedly looked for this exact product in the past, "wheel-augmented shoes", for my 10-to-30 minutes travels (to the shop, to the public transportation, to a friend's...). So as anecdata, I would absolutely be interested in this: maybe not at $1400 but I'd certainly pay a few hundreds.
> cultural association of sillyness and the aesthetic disaster that is "rolly-sandals with shoes".
I don't know how many "that's what was said of Airpods" are needed for this argument to die. Actually, I'm much less weirded out by these shoes than I was of airpods, I don't find them silly at all