How far can the Saudi Arabia revolution in football go?

On June 4 Crown Prince Mohammed Bin Salman extended his ever-growing empire with the takeover of Saudi Arabia's four biggest clubs; Al Ittihad, Al Nassr, Al Ahli and Al Hilal. The PIF (Public Investment Fund) had bought Newcastle United three years prior, initiating a cataclysmic transformation at the North East club. The focus has since shifted internally to his own Gulf State, where an unprecedented revolution has ensued over the summer with the Saudi Pro League the second highest spenders (£701m) and poaching a host of the Europe's global superstars. So after a month of digesting the seismic change which has seen the Middle East become a footballing powerhouse overnight, how sustainable really is their project?