I do wonder whether the negativity towards this stadium with regards to how far away you are from the action when watching West Ham play football, has had an impact. It was built for athletics, so it is not the usual stadium shape. The seating capacity for football is 57k, but rises to 80k for gigs when pitch standing comes in to play - considering you also lose the seats at one end for the gigs, this increase in capacity for the gigs, shows how far back the seats are.
Although Muse are still popular in the UK, I also wonder whether they are as popular as they were when they played stadiums in London over two days in 2007, 2010 and 2013.
Although they still have a hardcore following in the UK, I feel that those with a casual interest in seeing their gigs or buying their albums has dwindled. I know people who have been to one of their stadium gigs in London or have a bought a Muse album in the past, who still like them, but would no longer think about going to see them or buy their latest album. At the same time, I am not sure that Muse are picking up enough new young fans to replace those people who no longer go to Muse gigs or buy their albums.