Oooh, come on, now...
That's fine, you don't have to use the 4th spec. But I think it's quite likely we'll see some kind of fiery hellknight undead when and if we ever revisit Northrend to see what Bolvar is up to. There's already precedent with the flame revenants.That would change the feel, the appeal, the lure and flavor of the Death Knights, in both lore and gameplay. I play a Death Knight because of the lore and the awesome feeling of stealing souls, shattering enemies with ice and blasting their faces off with bolts of sheer unholy energy. I didn't sign up to have a melee fire mage.
For my part, I'd like a 4th DK spec to be Lich mode, and allow us to convert our DKs into ranged spell-casters.
I hadn't thought of what Xoroth would look like from afar, but that is actually a great concept to start from. Fragmented forever-burning planet chunks everywhere. Outlandx10.