Is it still possible to go through wall with Pikes?
Most definitely. Gotten a few kills with this trick.
(Longspear can do it too btw, though not as easily)
I really don't see any way for them to fix this without totally fucking up the pike though, and it really isn't difficult to counter as long as you know it's possible. Only really 3 ways of doing it: hug a thin wall and stab through, start above the wall and wiggle down, or start beside the edge of the wall and wiggle left/right.
EDIT: I like how we can get this much discussion when all the OP did was name the topic "Pikes" and post a frowny face.