It’s a fiction that the pvp rule set you like is some sort of everlasting “contract.” Blizzard’s own words are only temporary until blizzard decides to change them. As they did when they added warmode. This forum is set up for you to rant, cry, whine and complain all you want but the only real contract you have with blizzard is the eula that states blizzard can make any changes it wants anytime it wants for any reason it wants. The history of wow is that blizzard has always held itself to the contract they made with you that you agreed to when you signed the eula. They are working within that contract now as they change some pvp realms into pve realms and giving people a free transfer to grob or other servers.
The contract you signed with blizzard clearly states that pvp servers are meant to be as permanent or temporary and flexible as blizzard decides they should be at the spur of the moment for any reason whatsoever.