humm, you aren't too far from the truth indeed.
however, with "IF", you can imagine anything, that's the problem ^^"
Azshara was really a honorable and beautiful ruler among the Kaldorei. unfortunately, she begun to go mad and highly on herself and her highborne cast...
Then, it leads her to her tragedy : her allegiance with Sargeras, the black titan.
Considering how Illidan was going gung ho because of his magic thirst, things might go out of proportions.
But it is very true that Furion lacked of patience and open minded aspect, since arcane wasn't that impure to begin with, though extremely volatile and potent.
Granted, even Furion was easely defiled by the "dragon soul", when he was fleeing with Brox
no one except Chris Metzen can determine really what would happen during this war if Furion trusted Illidan better and the Arcane potency, which could be really a help, but could also be the downfall, if they begin to be addicted, then seducted by sargeras :/
as for the Sunwell... err, it isn't malicious at all, indeed. even the blue flight was trying to protect it. however, the sole presence of it was a bringer of war (who said that drakthan (sp?) bastard? ~~)
too much random factors i guess, mu...