Failing clubs, yes.
Is a 4th place finish (after flirting with top of the league) something an incoming manager is expected to improve on? Good luck to him if it is.
That is the point many are missing as we're not a chelsea, real madrid, man city etc, we have a wage cap, a certain budget so to sack a manager that as worked within this system and got us our best finish since the premier league started and shown signs of improvement in our latest season, is not just a huge risk, its unnecessary and could cause more issues.