Maybe Bravo has made the mistake of thinking that viewers only want to see the over the top drama and hostility in these shows because of the favorable response to incidents in earlier seasons (table tossing, etc).
But that's wrong. We want to see their regular lives ( which are not all that "regular" to us) which will naturally include some drama/strife but not a constant diet of it.
We want the good times and the bad.
I'm not sure if it's this change in the format or we've just become over-saturated with Housewives but I just don't have the same amount of interest in any of these women like I used to.