Hmmm, Just for fun, I would like to see one game where each inning, every player on defense had to rotate to a new position. Nine players, Nine positions, nine innings, could be fun.
If it were a longer term rule, consider all the fun one could have with stats. “Now Mark started as an outfielder in the first two innings but has now moved to catcher in the third .....”
I think that forcing a non-catcher into that squat would qualify as a US Constitutionally prohibited "cruel & unusual."