In answering my question... I have to agree here.
Even with a large oceanic expanse to move upon, the plates still need a 'barrier' of sorts to push against. Therefore, either the ice wall is still growing, or the plates are not moving anymore.
If molten rock + cold = solid rock (which it obviously does) then if the lava flows are active at even 10% of the ice wall, the Earth must still be growing outward, even if it is oblong.
OR it could be the plates are pushing all landmasses apart and expanding the earth in that fashion. Could this be the case?
Main thing is that new land is being formed everywhere, whether it be the sea floor or visibly above the water line. It must go somewhere...