I don’t believe that the arena reward system or the stat boosts are going to be a problem in the long term. I know it feels bad right now, but hear me out on this. This always happens when there is a major change of this type. It is the original meaning of paradigm shift. The rules which established the previous “norm” have changed.
People at the extreme edges are affected the most. The numbers that everyone has gotten used to over the last year will no longer be sustainable or attainable. Everyone will settle into a new “normal range”, and the boundaries of “top 500”, “top 100” and so on will shift and be represented by different ranges of numbers. In statistical modeling, this is called “boundary-layer turbulence”. You have a static (stationary and balanced) condition (“the old way”) which has a dynamic (new flow, repositioning, or a change in equation) condition (“the new way”) which will affect all of the inhabitants of the environment to some degree.
In short, things will settle out over time and when the dust clears you will still be as good as you ever were and you will wind up in the same neighborhood you occupied before. It’s just that the “numbers” representing your position will be different. Only people who do not participate in arena will remain unaffected… but that’s just delaying the inevitable for them. There might be some new people in your neighborhood due to the stat boosts, but they will be no different than your old neighbors, and might even be a bit more chaotic (hot/cold) than the “usual” opponent.
I’d suggest that everyone pay less attention to the “numbers” and more attention to the competition you’re facing. Eventually, I believe it will all settle out again.