Not a bad idea. 
remove them from the seers location.  We wouldn't want to overload the trees

Exactly, lets make the magic trees accessable only in certain places like Legends guild and this Woodcutters guild.

Wc guild 3 trees. Seers 1 tree.  Legends 4 trees (or a secondary place requiring 1600 total to enter w 4 to 5 trees.

IMO guild should have more or at least the same as legends.
Legends also should allow players in who have either one of the following:

• 1400 Skill total
• Legends quest completed (all quests)

There is already a WCing  guild, it just has nothing in there but a guy who can cert and un cert maples and yews.

I was thinking more along the lines of 6 magic trees at minimum. Look how long you need to wait for trees to respawn  and with the change trees don't last long at all. Would also like a good amount of Yews in there.

And yes, skillers island sounds like a nice goal. 1600 skill points seems reasonable. Should have easy to make glass, many trees, fishing for manta rays, high lvl mob spawns like fire giants, black demons, black dragons, red dragons, bank, cooking range or fire pit, furnace, anvil, and so on.