This is a pointless argument.
Until recently (VERY recently) I would have always classed us as a PERMANENT member of a 'Big Five' (Financially : which is the main thing and we still have that / and support/fame-wise / and "potential" (sadly, only POTENTIAL) to win loads of things and challenge for the Premiership season-in, season-out).
We have slipped, even from this position, over the last two seasons (ONLY over the last two seasons).
Remember, Chelsea are not, by any stretch of even the thickest persons braindead imagination, a "BIG" club.
They are a JOKE. A joke that goes bankrupt (afresh) every year!!!!!!!!!! Bankrupt, out-of-business - GONE, afresh, every year - be it by "£85 Million" (2005) or by "£145 Million" (2006) or whatever it is, afresh, each year. They get "Russian Grants and Donations" that rescue them from bankruptcy, every year (at the moment). It will not last, the bloke will be off soon, then they will VANISH.
Also, so many people confuse "Current successful T E A M" with "Large C L U B". Just because a small CLUB (like Chelsea, though they are an 'extreme' and artificial example) currently has a successful TEAM, that doesn't make them a part of any invented 'Big Four'
There will be silly people who cannot (will not?) understand what I am saying. That sort of person always thinks that "whatever is NOW always will be" - they cannot see how 'transitional' (temporary) certain aspects of 'now' are!!
Our status will never change, no matter how often little Monkeys decry it.