Ha, that's funny.
AC induction motors run at a standard speed, I think it's 1170 RPM. So a higher horsepower motor wouldn't make the machine run faster unless they changed out a bunch of specialized components, and God knows where they would find new components that worked and also fit into the available space.
Souping up the spin speed would cause more wear on the bearings and probably cause the machine to break down quickly. Or perhaps "fail spectacularly" with parts flying hither and yon.
I would have thought it more interesting to run a series of tests to determine the minimum achievable power and water consumption to remove a given type of dirt, i.e. KWH per lb. of load, and gallons per lb. of load. Though the various manufacturers probably do that during their design process, and it wouldn't make for "exciting television" like blowing things up.
I saw one of those programs on TV during an airplane flight recently, complete with those guys blowing up random stuff in the desert.
Are there any antique-restoration programs on TV that could be gotten interested in doing something about appliance restorations?