Is mixed seating on public transportation the cause of all our problems?

According to these Kol Korei's in todays Yated, the answer would seem to be yes. The cause of our problems is התרופפות (weakening) in צניעות specifically mixed seating on public transportation.

Is a lack of tznius really the biggest problem in the Charedi community? Are there no bigger issues that need to be fixed? A generation ago everyone went on public transportation with mixed seating and no one said a word about it. According to this Kol Korei separate seating on public transportation is required by halacha. I guess they disagree with R' Moshe's famous teshuva allowing people to ride the NY subway even in the rush hour.