Weight breaks/penalties aren't the answer either as there is a BIG difference in the effect if you're talking about a tighter, more technical track or an open sweeping track. The effect of weight is amplified in the former and minimized in the latter.
The whole concept/attempt at "equivalency" formulae is what is slowing the whole process down. When brushless are accepted it will need to be in it's own class (other than Mod) and the "similar" brushed classes will either live or die.
I, personally, hate to see them go. I'm worth doodly as a motor "tuner" but I can 100% appreciate that the ability to do so is still a BIG part of the hobby to a lot of folks.