I think you are missing the point, just like the decisions makers did.
There would be a lot to say about why the game is being played the way it is today and I do understand the logic to try and tweak it, here and there, to make it more accessible, more dynamic, etc. But i will go straight to the point:
How on earth can one possibly believe that this 25 to 15M and 20% tax, implemented from the very next season, would be a good idea at all?? This is appalling. As read in many messages above, ambitious managers are planning their roster and financial strategies 2 years ahead - sometimes more! that's 8-10 seasons ahead!
Everyone plays the game fair and square, everyone tries to find the right strategy, and attempting to be successful at the highest level requires times, planning, scouting, training; it often includes twists, setbacks, it demands patience - a loooot of it.
Implementing this rule in 3 months would kill years of efforts for hundreds of managers instantly, it would - literally - completely change the game as soon as today! I think it would be a total lack of respect toward managers who are playing this game seriously if this is implemented from next season. Those managers didn't steal anything from anybody and would be all of a sudden penalised.
This change must be implemented smoothly, slowly, with thresholds, giving managers to adjust. In my humble opinion, rushing into this would be, by far, the worst decision in the history of this game and would clearly demotivate many talented managers who, again, have been patiently preparing for years and would feel robbed.