Maybe they would lose their appearance money???????
LOL ... are you series?
I swear ....... that kind of serve..... disguised well before it is delivered...... is nothing but a total success.
AND........... while you're thinking about unusual new tennis possibilities ....... tell me why no player has never tried to play TWO forehands...... a left-handed forehand and a back-handed forehand (there is mostly always time to switch hands with the racquet between returns). There would be no need for a backhand.
Hmmmm.......
;-)