The problem is, the Premier League is like a run away train now they have largely fixed their wastefulness in the transfer market and hired top managers.
City, Arsenal, Liverpool and Chelsea are in safe hands with good-decent managers and recruitment. They will continue to be good for the next 3-5 years.
Man United + Spurs have insane amount of room to spend until they finally get the right players. They might have the managers now, given time.
Newcastle + Villa have really really good managers and are ambitious, trying to crack into the big 6. Good players and recruiting good.
Brighton + Bournemouth + Brentford have good managers each and excellent recruitment. Quite simply these teams are becoming rich enough to avoid having their players being stolen by any teams other than Europe's elite now. No reason they should get much worse.
Crystal Palace have an excellent manager and really good recruitment, a little more fragile than the 3 'Bs' as their manager and best player are likely to leave on a free soon.
Nottingham Forest have an excellent squad, just need a good manager now.
13 teams I've named who could be Champions League quality if they played in a different league.