Most of what you are advocating is what the old sky4 want(ed), ie dominance over anyone else like they had for years, and you'd have mufc winning most trophies, with lfc, afc, and cfc mopping up the dregs, so there is a bit of choice to be had here. Outside investment or not.
You probably only ever read about the money spent to win trophies, and know nothing about the money City's owners have invested in infrastructure around the local area of east Manchester, and that's probably more than into the team itself. The reason you don't hear about this, is that our media also want the old sky4 restored, so they don't report on it.
City, yes our club, took on a filthy brown field site that was a wasteground, they cleaned it up at great expence, then built a state of the art facility on it, to produce top quality footballers at a football "university" that actually starts with 8 year olds, not just to produce talent for us, but for lots of other clubs (2 of which helped you to get into the PL last year by the way). Nothing is ever said about this in the media, yet what do mufc do for football (at all levels), oh yes they produced the class of 92, over 30 years ago, and we'll never hear the end of it. Meanwhile City are producing top class talent (yes we make money out of it), year after year, actually developing footballers, we keep a few, but the ones that move on, are trained and educated by City, so we are giving back to football.
All we ever get from the media (and other fans) is slagged off for our huge spending, and because we "bought football". We didn't buy football, we made huge investments into football to get to this point, and very much not all of it has gone on players, large areas of east Manchester have also been improved as a result of that investment (and that continues today).
Anyway rant over.