Future of Elementalists for Raiding?
It’s too early to tell, because don’t know much about how raid mechanics will work.
Problem is the majority of abilities are designed around a 5 man party. This is different than games like WoW where the raids are treated as a single unit and each class brings something to the table that benefits the entire raid. That kind of composition allows for more variance in class representation.
If the concept of a 10 man raid in GW2 amounts to basically 2 5 man parties, then I imagine you will end up with 2 self sustaining groups with very similar compositions and less class representation in the meta. In that case, I think staff elementalist will have a place in a raiding group, not only for their DPS, but because combo fields are currently the best way to provide benefits to a large number of players at once and staff elementalist has the most.
If the concept of a 10 man raid is actually a single unit of 10 people, then I have no idea, because I have no idea how that would function. It would be completely different than anything we have seen before.