Conspiracy theories are unsubstantiated opinions.
Conspiracy theories are largely defined by the assumption that misdeeds have been done secretly when there are more probable explanations. Since it's far more likely that Geoff Johns is too busy with his many Hollywood projects to finalize scripts to the sequel to the most revered graphic novel of all time, that is a more probable explanation.
If more concrete information comes out that shows that Geoff Johns is really being screwed over by Dan Didio for some reason, then I will be right there next to you guys complaining about it. However, since we don't have any of that, this idea is a harmful conspiracy theory that does nothing to improve our comics community. All it does is pit us against each other, rather than bring us together over what we all love.
Conspiratorial thinking is fed by paranoia, fear, anger and resentment. We can disagree with one another, and with the creative decisions made about our favorite characters without automatically assuming the people who made them are morally reprehensible @$&holes.