Aside from the possibility that Arcan'dor fruits were already distributed to the population already, why would its destruction remove Suramar from the conflict? They can sustain themselves on the Sunwell now. And what betrayal? You need to have some at least semi-official ties to have the capacity to betray someone. There are none between Nightborne and Night Elves.
*An Alliance character falls for a bluff* "Ermahgerd HORDE BIAS COVFEFE". Because it's such a preposterous thing to have happened. Never happened to Horde characters either. You're falling to KrazyK's level lately.