They used to talk about the big four, but it's really hard to see past the top two now. Both just look in a different league.
The Future of English Football, or just a phase?
		
		
	 
I think it is more or less much of the same - most seasons in this millennium there has been a team that is pretty much unassailable.  At the moment we have two teams setting the pace which as great as it gives the others a bigger target to aim for.  In essence it's just the nature of the beast.
Teams evolve, tactics, evolve, playing styles evolve - usually with one team 'going first' and the rest slowly emulate them.
MCFC & LFC are enjoying a well deserved moment in the sun but within 3-5 years they will be caught up with and probably overtaken.  Arsenal are in the early stages of a complete revamp.  Chelsea and MUFC are in the even earlier stages of more radical revamps.  Spurs - I'm not sure what is happening there - damn good side but I think they have peaked and who knows what awaits them on the overhaul front.
What goes around comes around.