Folks forget, Kingdom Come was never meant to be a blueprint on how to handle these characters properly. Each member of the Trinity screwed up in some way the 'real' versions wouldn't. Diana being a warmonger, Bruce being an authoritarian, Clark abandoning humanity....these were broken, failed versions of the characters, not them the way they're supposed to be.
I'd think Wonder fans would breathe a sigh of relief over it, honestly. Waid's not writing Diana as she should be, he's writing a failed version who had to fail in order for the dystopian future of KC to happen. Better this than him writing the main canon version is it not? Anything he does wrong here is actually doing right by that specific version.
Granted, DC saw the sales figures for KC and all the rave reviews and they learned the wrong lessons from it, for a long long time. But nothing Waid does today is going to make KC's influence any stronger. And I feel like the one person we can trust at DC to remember that KC isn't meant to be a blueprint is Waid himself.