Reseting all teams assets every few seasons is a horrible Idea, I would leave the game if that happen - and I think I wouldn't be the only one.
Currently the case and fact is that users leaving the game due to its being not competative for new teams, so you leaving the game (or more presicely threaten to leave) is not such a big threat comparing to that.
It also proves that you are afraid that this will change the status, and it shouldn't have if the claims that the best managers are on the first Div.
I'm right now for the second time in the Austrian Bundesliga, while most Teams are rather old (Season 6 and older) one Team was created in Season 12, another Team created in S12 finished second in II 4
This just proves again what I'm saying.
Those very few who gets to this league are due to others leaving the game or managing very poorly their team.
Comparing two managers that has the same skills but started on a different season will find a big difference in production.
If a cap would be introduced I would earn quite a lot more than these young teams because of my arena .. and because with the money I already earned it is easier for me to afford players with decent secondarys from the TL
And again I need to repeat myself...
You have more money now, so there you can do it now with current system as well.
The only difference is that you will pay to the league for any exception between the caps.
It is also sounds not reliable when you say that "you are against it because it will assist you".
And ofcourse, the "sudden carreer-ending injury" suggested had not been brought up, because this is even more clear to be a greater lost for those with better fortune.
And I'll repeat again an amazing fact - those who are against it are exactly those who gaining from current system that is not competative for new teams.