Hopefully they just expand PotD to lvl 80/90.

I agree skill progression needs a major rework.

The problem is for the OP's idea to work they would have to create an instance zone, then there is the issue of handling the problem if the player does not have the job unlocked but would like to try it. So a new system would need to be created entirely. From a new player perspective it sounds great, from an existing player perspective many would just say they should have expanded PotD.

If they do add it. They should add it to hall of novice. The instance is already there and it could be used a deeper learning opportunity for new players.