That lesson has yet to be learned, perhaps because the pressure during sweeps is so intense. Viewership as measured during sweeps months sets future advertising rates that directly affect a station's financial health. That's the reality. So stations will try just about anything to do well. Never mind that it wasn't due to snow for four days, and when the storm came it didn't amount to much.
Fewer viewers seem to be falling for the hype.
So far, stations have responded by shouting louder and aiming lower. So brace yourself. There's no indication that May will be any different.