I'm really hoping that is the reason because we are coming in February and I am NOT a big crowd type person.
If you are coming the Presidents Day weekend or that week, you might be in trouble. Otherwise, I imagine it will be back to normal--which is still on the crowded side.
One tip--during crowded times when IoA is open late, lines for everything but Olivanders and FJ seem to drop in the late afternoon, then disappear after dark. Sunday night my friend and I walked right up to the bar in Hogs Head, then had the patio to ourselves. None of the non-wand shops had lines, had a private train on Hippogriff. And the land looks even better after dark.