Even if the old top 4 are conspiring, and I don't think they are, it's just cheap headlines on the back of pre-match Mourinho games, there are a few things which should reassure:
In no particular order:
a) City's Chairman predicts City to be profitable in the season 2013/14, and while this does not affect the previous monitoring period, it establishes a trend.
b) In the Summer window, Man Utd, Arsenal and Chelsea are going to be spending heavily whilst City spent nothing in the last window, and over the last 2 seasons, Utd and Chelsea's net spend is greater.
c) The controversial deal is estimated to be worth £400m over 10 years, yet that is fair-value, and £40m is just 15% of City's revenue for 2011/12 and if it's a flat fee, it will shrink as revenue grows.
d) There are other clubs whose sponsorship deals and financing are a lot more "suspect"
e) FFP is widely seen by a lot of people as a pretty obvious attempt by the old clubs to keep out the new. The propaganda war has already been won.