Well one of the stated aims of the place is to bring through better youngsters. Time will tell if they make they grade at City, but other clubs will certainly benefit from players who don't make it.
I agree these facilities are exceptional, but all over England and Wales millions are being spent by clubs on similar, if not as extravagant, developments. Already it's paying dividends, eg. the world's most expensive player is Welsh - FFS who would have believed that!!! And look at the England game the other week, there was a real gulf in quality between the sides that i don't remember being the case back when we played them regularly.