You fags should come play with us (PM me for details!).
On topic, the only problem with separating class defining abilities as endlines is you're going to have a bunch of toons who are the best of both worlds, especially healers.
Like all Clerics would take Sanc. Shamen would take Oberon over Pandemonium. Spiritual Circle over Lunar Attendant. Spirit Dance over Cannibalize...
All bards would take JC over Gravitas, Percussion over Requiem, Blades and PotM would be split, but well that's one of the only few I can really think of. I guess maybe it could work but it'd take forever to plan out to make sure people who went like JC couldn't get Percussion because it was really deep into the tree or something forcing you to get Aria's, Dove Song, etc; but then you'd basically be a Troubador right now so it wouldn't really accomplish anything.