Haha, I actually do think the BB economy is in a very healthy state, with high salaried players being possibly the only major problem. I'd be in favor of tweaking the formula, but be aware that dropping the salary of a 400k player by 50% to 200k can't be followed by dropping the salary of a 50k player by 50% to 25k, and so on. That would ruin the BB economy.
Maybe the formula can be tweaked for high salary players only - and maybe that tweak is as simple as a cap on player salaries.
(btw, the money saved on player salaries would be re-invested in the now realistic high transfer prices for these great 200k+ players, with the only difference being that finally, the players are sustainable!)