I just want to let you know a little more about weight mechanics.
Weapon weight does not lower wpf. Also, if it did, that would only further make your suggestion stupid.
I will also rescind the comment on the fact that a 10 weight long spear could not be crush-through, and If I overhead then thrust at you you would be weapon stunned so long you would not have a single chance to swing back. It is true that the pikemen would move MUCH slower. Also, this notion of hoppy hoppy pikemen in 35+ armor -- well, 35 armor is low-mid tier armor, so that is conceivable -- But there are no heavy armor players that can hop. Agility stackers don't put heavy armor on for various reasons.
Anyways, that is a pretty terrible idea objectively speaking.