I don't understand it fully but gut feeling says it's too unpredictable due to complexity.
Would hate some unpredicted nasty side effects!
Discussion
The 'good' thing is that iirc, this can work NOW and doesn't require a fork or any new code. So whatever damage could be done is already possible.
I don't see it working out well for anyone but miners in the 'uncooperative' case, at least in a high fee environment.