I read most of the exchange aren't going to support BCC so why you would do panic sell just for that coin? I personally don't know what's going to happen with the market on August 1 , if it will be green or red, who knows?
As they say change is the only permanent thing in the world. So upon the bip update, im sure there are some styles that would remain but almost many would change there habits and strategies will also come up. Though the same and probAbly a lot also of the altcoins will update there own sites depending on the changes of the bip.
If you just know that the first one that did this Segwit before is with LTC. And it became a very successful one. You had mentioned that change is the only permanent thing in this world which I agree. Technology is getting faster and there's always a need to upgrade and update especially in crypto's.