It may well be but it's the way of the world though - take a look at Barca, Real Madrid, Bayern, Athletico, Dortmund, PSG, Juventus and even Spurs over a similar period.
Arsenal and Man Utd are much lower due to the obvious reasons but even Man Utd have started to get in on the act since Fergie left.
Since RA purchased Chelsea no English team has won as many major honours (15 us and 13 Man Utd - I totted this up in my head so I hope it's correct!

).
Even Phil McNulty has acknowledged today on the Beeb sport website that RA has disproved the theory that only stability brings success.