To be honest, the U.S. really should have switched during the late 19thor very early 20th century before the benefits of the industrial revolution gave us so much stuff that needs to be converted. Even if we converted tomorrow, we'd still be dragging around imperial measures for decades, maybe a century.

I can't see cooking or property measurements making the transition within my grandchildren's lifetimes. In most countries that have metricized, property remains a very stubborn holdout.

Commercial products could convert much quicker, it's mostly a label change during the next minor packaging refresh, followed by the next major packaging refresh adjusting the size to make the unit look better. (1lb -> 453.592g -> 450g)

Paper might take decades, companies have significant investments into handling standard paper sizes, from production to clipboards to file rooms. Going paperless is probably more likely. My local mechanic is now almost entirely paperless for example, but the final bill is still printed out on 8.5x11 paper and a copy filed away.

I agree that manufactured goods should just set a date and switch on the next model year. Eventually the older imperial items will just rust away, with a few examples kept alive by very dedicated hobbyists.

But some niche craftsman fields will probably never switch. Printers still use points and picas despite trying to metricize for a long while. You end up with incredibly awkward metric units for these things when you try to convert, and lots of the handiness of customary units (easy fractional divisibility) comes into play.