I was just watching some highlights from 1986, and the Garden was a zoo. Loud as hell.
I think the infusion of the wine and cheese crowd is a large reason. Its a win-win for MSG -- these are people who have money in their pockets and it works from a marketing perspective to say they "cleaned up" the profanity and questionable behavior. Nevermind that a guy making $50K a year would have a pretty tough time bringing his family to a game...thats collateral damage.
The first time I went to MSG was in 1989. I probably heard some things I shouldnt have heard as a 7 year old, but walking into the big arena is something Ill never forget. It pains me that families are getting priced out and younger kids are missing out on those types of moments.