They’ve no really underachieved. Throughout that time they’ve not competed with Man Utd & Chelsea & for the last 10 years not with City either. They’re only really underachieving this season as with their budget they should be battling with Spurs & Liverpool for 4th. Won FA Cup’s the last 2 seasons. Only Chelsea & Man Utd out of the top 6 has better seasons last year. I think he should go but they’ve definitely not been underachieving for 10-15 years. They’ve performed in line with their budget, used to compete for the league when it was just them & United but not been able to since City & Chelsea got rich ownership.