Almost certainly not
> will it continue to work well in 20 years when it stops getting updates?
Mostly likely, yes. Apple products very often have much longer lives than their competitors (if taken care of, obviously)
They won't make a product for you and they'll make lots of money.
LOL probably true. I hope that doesn't become the norm however. I refuse to take the depreciation loss on a new car, and if cars can't reasonably be expected to last 20 years (with repair/parts availability) I'm not sure what I'll do. Keep an old Red Barchetta in a barn I guess.