Well yeah,having the most money played a role,but overall more and more clubs began to see that the difference is clear. These top-rate foreign coaches brought a new flavour and higher levels of play,that English coaches of the old stock couldn't challenge them much.
So one by one, big clubs began to go for their own top-rate foreign coaches and even smaller clubs also went for same or at least(for want of spending power) coaches who may be English but have this new coaching mindset ingrained in them.
My pleasure.
Cheers