I'm just curious, what if "lolwell" worked like a Soulwell. You click on it (25 charges) and you get to pick up an item in your inventory. Except this item was a Wild Growth style HoT (heavy at first, light at the end) instead of just an unimaginative Healing Potion that's on a seperate cooldown.
To keep a priest from spec'ing Holy for it, and then back to Discipline (or shadow) for every fight, make the item in your inventory give you a buff. "Lightwell Radiance"; have it be a physical buff, but losing it destroys the item. (Leaving party/raid, or said priest respecs).
I don't know, I'm just grabbing at straws here, but I desperately think something needs to be done about Lightwell. How's this?