Arsenal have changed as back in the 90's they were like United and when they missed out on the top 4 have been struggling ever since. It takes huge spending and commitment to stay in the top 4 and who knows if they can achieve this again. Tottenham, Man City and Liverpool will achieve it so there is room for 1 more club. One would think Newcastle will be there within the next 2 years so it is going to be very difficult for the others to achieve this.