If Ankama wants to 'Improve' Panda's they need only adjust what doesn't work currently. Revamping the whole class for the sake of a revamp is ridiculous.
I like the suggestion about having the barrel cost 0ap to manipulate. It keeps the fun elements of panda attacks surrounding the barrel. It allows dual element to exist better with earth. It also aligns the reward for using the barrel with the time and thought needed to position it properly.