I totally get your point and you're absolutely right. With or without the punishment the damage is already done. My 8 year old son plays football and I see many City, Barcelona, even Al Nassr shirts. These little kids don't care about human rights and they certainly don't care about City and their 115 charges.
Us loyal PL followers will know what happened, but the world goes on and I can see the majority of the people, even common football fans, don't give a toss about clubs cheating. You mentioned it already, Juventus was punished and relegated, yet many football players, stars, even Ronaldo signed for Juventus and I myself already forgot about Juventus cheating.
If the FA punishes City (and I'm 100% sure they will, the only question is: how severe will be the punishment), let's say, 10 points deduction and a fine, then so be it.
I have no time nor the energy to cry about it and I trust the FA to do a thorough investigation. That's all I ask for and I will accept any outcome.
However, Manchester United and us United fans know, Liverpool (City's nearest rivals) and their fans also know and we will never let City fans forget about their conduct and cheating.