Personally I find tree wars a big yawn. Now if the majority of Glitchens want tree wars, I am down with that and can adapt my game play. However, I suspect the majority of Glitchens would prefer to spend time doing something other than trying to keep certain kinds of trees available so that new players can complete quests, etc.
Because trees are easy to kill, a small group of people can, in effect, impose their idea of fun on the entire community. Imposing your idea of fun on other people seems to me a lot like imposing your views of religion or politics on people who don't want to hear about them. I don't need to come to an online game to have that kind of experience.
So here's a proposal: Let the community decide. Provide a way to "bond" trees to the world so that, if enough players provide bonding energy to the tree, the tree cannot be killed except by rook attacks. If the player community wants to make sure there will be spice trees on East Spice and West Spice, people will take the trouble to "bond" those trees, while perhaps leaving others areas free for those who want a PvP (yawn) game.
UPDATE: Let me put this a different way. As it now stands, a small group of dedicated people can change things one way, and a small group of dedicated people can change it back. I'd like to see mechanisms for larger community involvement, including ways a player with limited time can invest in community rather than simply doing quests, leveling up, and inventing personal goals to pursue. Let's say you don't have the time to guard trees or monitor the tree population and re-plant as needed -- as an alternative, would you be willing to, say, die to help save a single tree?