Dude, traditional fans get angry at everything. I've literally seen fans get mad because Clark claimed his favorite food was mustard covered pretzels, because in another issue years before, he said it was Martha Kent's apple pie. And this is the internet, the land of mock outrage.
Honestly, I think this is the beginning of re-building Clark and Lois' relationship (maybe not into a couple, but still). They'll start at rock bottom, and Clark will have to come to grips with whatever greater good propelled Lois to out him, Lois will have to come to grips with Clark's true nature. They'll see each other in a new light, and while there's certainly going to be drama and angst, they'll find themselves becoming closer than they have in years as they work through this newest shift in their dynamic.
But the point of all this is just to sell comics and make money. That's as far as that goes. You can always trust businessmen to worry about the bottom line first and foremost. Which is sort of nice in an odd way, you dont have to worry about ulterior motives. They'll do what they think will sell, and while their own opinions obviously influence that choice, they dont get to act like idiot fanboys and get on with all the ridiculous arguments and ideas we do here. No one wants to be the guy who made a long-running and popular character fall to ruin, after all. They'd end up in trouble at work, possibly fired, then unemployable afterwards. No one wants to hire the guy who ruined a popular and long-running character either. Their families would starve and friends, sensing the stench of pariah-ness, would abandon them. Hellfire would rain upon their homes, and disease would run rampant through their halls.
You're really not a Superman fan are you? You're also ignoring a lot of things from the past. We've seen Superman attempt to cure cancer and speak publicly about the larger, complex problems in the world. But even if he could solve all our problems (which he cant) what would be the point then? A dictator telling everyone what's best for them? Isnt that the plot of Injustice? Now I do agree that I'd like to see some real socio-political changes in the DCU, but corporate comics are never going to allow their settings to evolve beyond being a reflection of the real world. That's why, in post-Crisis, there was no such thing as a cosmic energy powered car, despite the technology existing since before World War II.