We didn't win a prem 2 years ago. That will buy you time and goodwill. List management should be dynamic and ongoing, not boom bust, bottom out, fall in a hole, start from the bottom.
Watch those 2015 games. The football was ugly, error ridden and we fell over the line in a lot of games and bounced out of final quick sharp. Hence the plummet to the bottom the next year, which in memory, no minor premiership side has done. The rot started there.
But clearly, things are looking up 3 years later. Oh wait...