Originally Posted by
traen
Definitely a good idea.
The only thing I don't like here is this "Additional XP boost".
Players are not idiots. They always choose the fastest way of leveling. If running scenarios will be the fastest way to earn XP, they will stop doing anything but scenarios.
So yeah, scenarios should be available from 85 and onwards, unlocking several scenarios every level. Players should be motivated to complete them once, slow and thorough, completing all the subquests, learning new interesting things about lore.
But scenarios should not be used for leveling like lowlevel dungeons and they should not give you enough xp to skip questing.