The main thing the Sheik and Roman have done is show that you don't have to build a football club, or 'earn' your right to the top. They've brought a feeling of 'winning the lottery' to football clubs, where it doesn't matter what position you're in, or what state your club is in, if the billionaire picks your name out of the hat, you're heading to the top whether you deserve it or not.
They've also taken away the element of 'fantasy' about football. There was a time when reading a player like Aguero coming to England was the stuff of fantasy, but now it's just another player coming to England. Can you believe a player like Robben played over here? No, you can't, because he's just a run of the mill world class player that was deemed surplus by a billionaire.