Just give a polearm weapon a power attack that is a poke. They pull back nice and slow building power, and finally jab. That way spears can't poke people so much out of range that the weapon is over powering...and spear people have their weapon...
Also...this way there won't be so many people upset about not being able to poke...and not so many people upset about seeing over 9000 spear threads.
I think we could balance spears in other ways, other than just removet them and kill their nature.
Low durability, they break often.
When blocked, and shields could deflect them easily, the "recoil" effect is prolonged greatly, which if the spear were deflected from a thrusting motion, it would glide past the user, increasing vulnerability.
Slower.
Maybe, at lower levels, the spear can miss (like accuracy circles for marksman, sure it might be weird, but thats an akward move to make with 1 hand)
Claymores have a long reach too, although not as long, and they are balanced properly.