I've played WoW since US closed beta and gradually got bored with it over time. Burning Crusade sparked a little interest, which faded, same for Wrath of the Lich King (with that gorgeous new continent). Cataclysm did nothing much for me. I've hardly played it since even before I knew of Rift but once I knew, I kept track of it and pre-ordered immediately.
But no, I won't stop my WoW account. I've been playing with these characters for years. I have fond memories, they have given me many, many hours of fun and I can't just kill them off. That would be cruel. I'll park them in an Inn some place, nicely together, and retire them as old veteran warriors.
They might pop in once in a while to moan and ***** at the youth of today, as old timers are prone to do. Saying things like, "Back in the old days, when we actually had skill trees, and characters were easy to play but hard to master since we had to make balanced choices ..."
Seriously. The day Blizzard killed the skill trees and only allowed point distribution over more than one after a certain level I knew it was game over for me. I don't want my choices being made for me, I want to make my own, and learn from my failures. I'm completely in love with Rift's insane versatile soul & role system.
Some future WoW patch will give you a button to select your skilltree at level 10. "DPS Warrior" or "Tank Warrior" and you won't see a tree at all. You'll also get an epic or two. And a free mount.
I'll feel for them, my trusted heroes, made redundant by the corporate desire to cater for the lowest common denominator. I seriously hope Trion won't buckle that way.
Don't fight back. Fight forward.