Michael Carrick is looking increasingly likely to leave Manchester United.If Wednesday night's dreadful 4-1 defeat away to Como isn't the final straw, Bournemouth on Sunday could be. Defeat to the Cherries would represent another disaster, surely one that Sir Jim Ratcliffe can't allow. Carrick, having guided them to third in the Premier League table last season, is now in charge of a team in freefall.Now, more than any other point since Ferguson…