When it comes to an Arbourist/trees, I really like the idea of SLOW growing trees.
Currently the maps are huge (for the small towns we make) so I think it would be excellent for wood eventually to come from far sides of the map. Just like in real life, where the easily grabbed wood around towns disappeared quickly. This would make roads and speed buffs more meaningful later in the game.
So the forester (or arborist or whatever) would plant new trees, which would take a long time (at least 7 game days) to grow one stage.