SE will over do it, then you can all moan its taking to long to level again..

Look its over cooked fair enough..
Not Everyone likes killing mobs over and over again without some actual content..
Let them get on with it till the patch you do what you enjoy..

All they need to do is put a penalty on for a player X ranks above claiming to say from 5% at 9 ranks above to 90% penalty at 20/5ranks above?
An make it so players ahve to do an action against a mob to get Exp. (one mob not all in the chain)

It wont stop power levelling in some ways, but it will def stop the afk to a large degree, and still let people help each other out. (and PL slower but still affective for those who hate mob grinding tedium)