Well if blizz wants to change tree form, they should do it like one passive talent
like the hunter's Sniper Trainning, if u stand still for lets say,
10 secs, u start to shapeshift to the tree of life
and keep in that way untill you move, like,
making roots on the ground but not really rooting you, if u move, the shapeshift breaks, thats all
passive talent, no usage, it would be cool in my opinion.