I'd vote yes for this.
Any improvement is better than nothing. That's all I wanted. Heck, I'd vote for any improvement as long as it didn't make things lopsided. I just want a fair amount of abilities to each class.
This would also encourage people to attack tougher opponents instead of easy targets all the time.
Kman288, you and I do the same thing, target a few tougher opponents and get high exp and then have to sleep to heal up. Doing this means you will never get a bunch of duels done in the same day. Which makes the high dueling motivation somewhat useless, but that's the way I choose to play the game. That's not a fault to that ability.
I don't know if this will completely even up the Dueler Class to the others, but It would be a benefit. Most duelers can not do any jobs worth spending time on. So to me it's a big improvement. Those that target the easy targets won't feel it improves anything at all. but maybe they should think about there method of dueling.