The infrastructure stuff like great training facilities in combination with some initial spending and then moderate ongoing support as they gradually built themselves up more organically would have got them great pr and when or if they eventually starting winning stuff it would have been a great feelgood story, but instead they decided fuck that and cheated with their spending which has inevitably ended up with this backlash.
City should have been realistically aiming for a Leicester type model. Good rich owners, Invest some cash, build a 30-35k stadium, spend wisely, develop and acquire players and manager, grab the odd trophy, build some more. They just aren't sustainable at their current size, shape, investment scale etc (if they stay inside proper and fair invest levels). But if they did it right, the real fans would have had a great journey and would still be able to have their odd cup final days etc.
Not being local, I never ever meet City or Leicester fans. If I did meet an adult City fan they would almost certainly be band wagoners or under 15. I think that's ok and normal if it's all done fairly. It took Chelsea a generation to get any significant fanbase outside London (using pre FFP cheat codes also back then). Whether what Chelsea did was "fair" is well past , but they even look like they are resetting these days.
If City put their hand up, took their medicine, restart the journey, rightsize to their true level then that only leaves the dodgy background of their owners to deal with. But if they were at the right size and balance, they would maybe be sold to a realistic owner some day when AD gets bored. The rest of the footballing world would wish them luck on their turnaround.
Anyway - At this point it looks like that's not going to happen, they are digging in and standing their ground. Hard to see where they go forward from there if they don't put their hand up. Do they keep to "plan A" throw a ton more money at it and keep breaking the rules?, or do they try to rewrite them? What other club will buy into them winning this? (PSG only I guess?) If they don't back down, surely it blows up one way or another.