They are getting buffed, sure, but the buff isn't massive. Does Ascalon going from Assault(L) + Pride(M) -> Assault(L) + Pride(L) make it better? Absolutely. Are you going to brick it over good triple skill weapons? Prooobably not.
I think the biggest winner will be Merc Axes, since just two of them will hit burst damage at that point.
While Ukko Axe has a similar gain, Thunder has access to Marduk Hammers which make Exceed less important for Thunder.