Which professions do you think would this fit with?
I think spears have a lot of potential as a ground weapon. Some classes can wield it as a poke-y mid-ranged weapon while others could have it as a sweeping aoe weapon. It can also be used creatively as a thrown weapon either physically or magically.
Personally, I'd like for warriors to gain access to spears as a ground weapon and have them play as archetypal spearmen. Mesmers could also use it as sort of a levitating weapon around them similar to how Xaldin from the Kingdom Hearts Series uses his spears. Would be a much needed power option for mesmers.