It shocks me that you can conclude this with no evidence besides Windhorst.
What is Blatt doing or not doing that is not having a positive impact on the team? When the team wins, do they not show locker room footage of everyone paling around with their coach and planning their next practices/moves? Do they not seem to like him there? Does he behave badly for our culture or represent the franchise to the media poorly? Like what actually empirical argument are you giving us that isn't windhorst gossip or "cavs lost, blatt must suck."
Is it blatts fault the team has some personnel issues and holes in regards to defense? That makes him a bad fit?
I don't get it. Offer something at least besides "blatt has to go!!! Shocking!!!"