Better off to ask when the last internal combustion engine will be turned 'off' in America.
My bet is the year 3004A.D.
They're too [censored] handy for logging, marine use, general transport in sparsely populated areas, off-road.
3004A.D. even then, there will be iconoclasts who run them on the sly, like that RUSH song from decades ago.
more like 3888A.D.