It's a reasonable inference to make, not to mention that Dalaran is buzzing with ley energies.
I am sure both sides regarded it as a betrayal. Nonetheless, it was not as though Rommath went around forcing all elves to use fel. Fel was utilised because it satiated their addiction, and above all else, was a powerful weapon. Felfire is incredibly hard to resist, and as such was an ideal weapon against the Scourge.I don't mind that they've done it, but you can't argue that the High Elves then don't have a same right to see it as a huge spit in the face.
The high elves limited themselves a lot more than the blood elves (and humans.) The high elves who survived once the Sunwell imploded were lucky. There was no way to predict at the time whether they would have survived in its absence. I would add this is just more poor writing on Blizzard's part. Quite frankly, I'd say the blood elves are better at controlling magic.Tell me what is the difference between them and the High Elves who mastered their addiction then? Are they just weaker overall? Are the high elves suddenly better at magical control than the Blood Elves? The sole reason they turned to sucking off demons is because they couldn't handle being without arcane magic. The High Elves in Stormwind or non-Quel'thalas places were able to do so just fine.
Both sides took a gamble. However, it is reasonable to assume that the high elves did so knowing that they could draw on ley energies in Dalaran, or from the moonwells. This is with the fact in mind that their numbers were minuscule. Is there any prospect that all of the surviving blood elves could have? I doubt it.
---------- Post added 2013-05-23 at 02:46 AM ----------
Compared to residence in Dalaran and having an Archmage in her presence, the canon lore rationale sounds like sheer nonsense. They can resist the ill effects of their addiction by meditation according to the WRPG, but it leaves it open as to what that meditation involves, i.e. whether it involves drawing energy from leylines.