I suppose I must, kenny. Potting the pink means the frame is over (and lost). Following through means it is still alive and he still has a chance (albeit very slim, but a chance all the same).
The difficulty I see is in managing or adjudication of a "deliberate foul". Certainly in the professional (or indeed decent level amateur) game players should not follow through in the manner you describe. But they sometimes do even though they will gain no advantage from it. So it does happen accidentally.
I think a "deliberate foul" rule would have to entail the referee warning the player before the shot is played that if he follows through/goes in-off/or whatever it will be called as a deliberate foul and a special penalty imposed (such as balls replaced as with a "miss"). I think the potential foul will have to be clearly identified before the shot is taken but I just think the management of such a rule would present problems.
As an example, a few reds left at the top of the table, player in baulk, no pot on but no safe way back to baulk (or any other "easy" safety). The player decides to go in-off, forcing his oppenent to play from the D. A deliberate foul? Even professional players go in-off quite regularly. How can a referee call a deliberate foul in these circumstances?