I posit that if saplings were to auto-plant after a set amount of time (30 seconds or ~the despawn time), that it would improve the Wild by making it more dynamic. As it stands, it is static and most people going to the Wild do not replant trees after deforesting to crank up their woodcutter level.
Bonus: incredibly minor chance to grow one of the special object trees used in the Wild (only if it grows naturally and not if bonemeal is used).
I do not know if this would cause more lag. Perhaps someone with modding/mod-playing experience could comment.
-MD