The players will do what the PFA instructs them to do, which is highly likely to play the fixture in order to not breach their contracts.
Would love to see the players walk off, but that's fantasy stuff. Us as fans should do what's within our control; boycott the games, boycott the merch, disrupt games wherever possible, and cause the absolute maximum of embarrassment and financial strain to the current custodian as possible.
Anyone fully behind getting rid of the current custodian isn't even remotely tempted to pay and go to the Sheffield Derby IMO.