I love the game andy, and i've been trying to get involved on forums (lots of card suggestions and stuff) ,I agree with the Bonus ladder reset with all the possible abuses that are currently in because of overlooking (not your fault).
but i would like sadly say i think if there is a Level reset to 20 i do not know if i will find myself continuing to play because of How hard it is to gain levels. perhaps instead of a flat reset down to 20 maby around 70 would be more reasonable imo. (i was around lvl 64 pre wavemaster/bonus round patch).