Steem Keychain can be used on other platforms than Steemit, such as SteemPeak, Busy or Esteem. This window won't appear except on Steemit.
No we won't take Keychain down. Yes, the current situation requires politics, we care about the future of this community, whether on Steem or on a new chain. If you re not happy with Keychain, you re welcome to uninstall it or modify it, it's opensource.