I think that Capello should stay on as manager. He has had no time at all in the job, to create a World Cup winning team or even one that gives a reasonable showing takes a lot of time. He is well qualified has probably learnt a lot over the last few weeks. The job itself is a nightmare (a well paid one however) just remember those managers that have failed before him, including Bobby Robson one of the finest football managers this country has produced,only to be hounded out by the press after we lost on penalties. He was seriously let down by his players, his decision to bring on Heskey was to try and create chances for Rooney,Cole, and Lampard had he done so the decision would have been considered masterful, not pitiful.
I remember the team that Capello inherited and he turned the team around to one feared by most and one of the favourites to win the competition. The fact that they did not perform for him in three games does not make him a bad manager.
Al