It doesn’t mean you have to totally abandon your PVP character.
It allows you to create a new character on a PVE server and start playing again without the hassles. If PVP settles down to the state when you can tolerate the PVP then play again with your current character. If Blizzard allows character transfers then you can decide on what you want then. Or when Battlegrounds comes out, you can decide on which server to play on.
It gives you options instead of being stuck on what Blizzard decides to do.