In 2002 Chelsea spent 500k on 3 new players. That season they finished 4th. They had some good players, and some not so good players.
The very next season, out of nowhere, in came a new owner, spending 150m on 17 players. They finished second
After a good season, a full season of playing with each other, the team decided in invest another 60m on 5 new players. That team went on to win the league for the next two seasons.
***************
I am not really expecting an overhaul either, but I would like one. Next season we could be in a total transition. New manager, with a complete new style of player. Whether we have a bunch of new players or not, having this new system is going to be new for the squad anyway. Wouldn't it be better, bringing in 5 or 6 players (not 17, which would be even worse), spending a season gelling them together. I think with 5 or 6 players, you will still keep the core of the team. I think 4th place is very manageable if we did this. Quality players, are just that, quality.
This would give us a great foundation to build upon. With this strategy, I'd be happy back in the CL, rather than just push for the title, but I'd expect if 5 or 6 players did come in, we'd push better than we did this season.
The problem with our squad is, we don't push out the clearly bad players, and these have built up over time