Likely?
I have two level 60s. I haven't played either in around a year. I don't wanna go back to them for Burning Crusade. One is naked - I sold all her posessions for gold to spread out among my many alts. The other is clad in greens - he would do me okay in Outland, but he's on a PvP server which I don't wish to play on anymore. That and it would just feel weird to go back to him now. Besides, if I did, I'd eat up the 60-70 content in a month and I'd be back to being bored with the game. So I plan on creating a Blood Elf, because I've never had a Horde character above 30 so it'll be an 80% new experience for me, roughly speaking. This Blood Elf will last me a good five to six months as I get from 1-70. No altitis, no dancing back and forth between characters. I'll be focused, like I was with my first character and when things were so much simpler.
In order to maximize on the "new car smell" I want to get going with this character, I wanna roll a Paladin. It's the closest thing to a new class in the expansion - a BLOOD KNIGHT. But then I wonder...am I gonna get to level 15 and end up in a party with five other paladin in Ragefire Chasm, when groups are forgiving? What about when I get to Shadowfang Keep or Blackfathom Deeps? "Sorry, we already have a tank paladin and healing paladin." "Another BE Pally? Heck no." "Sorry, we have like seventeen BE Pallies in our guild already." "blood elves suk a$$. party ldr, remove this guy from the party or im quitting".
Perhaps I'm just worrying too much, but I'm seriously having trouble deciding whether the price of new, unexperienced content is worth risking plunging head-first into an Azeroth composed of 25% Blood Elf Paladins.