While this seems at first blush to level the playing field, to give police a good reason to pause before engaging in unlawful conduct such as occurred in Barnes, it's never quite a fair fight. First, the police will still be the ones to initiate action, meaning they can do so, plan it, execute it, in a way that will invariably favor them and their safety at the expense of the citizen.
Second, the cops have weapons, and more of them, that you don't have. Whether tanks, drones or merely a few dozen automatic assault rifles, they are nothing if not well armed. What are the chances a guy, half asleep, is well-positioned to fend off a SWAT team? He may get one of two, but his chances of survival are slim to none. Once bullets start flying, the police aren't going to stop until someone goes down.
Third, the police officer who stops your car, whether you believe rightfully or wrongfully, is coming at you with a serious concern that might not take the stop with equanimity. He's going to have his hand on his gun, and he's going to be ready to use it. Reach for your registration and it's a furtive gesture. Boom. Don't expect the cop to hesitate, and don't expect the legal system to blame him for it.
If this law restores some degree of balance, appropriate concern without undue fear, then it may well accomplish its goal of telling the Government that it is not entitled to illegally storm a home simply because it can. Certainly the courts are incapable of stopping this from happening, as if the police had any concern about what a court might say. That something more was needed to remind the police that they don't own us is beyond question.
Yet, this may be a recipe for disaster. Not the disaster that Downs fears, but the disaster of cops shooting people first because they fear people exercising their lawful right to resist with force. As I'm not from Texas, I don't want to see anyone die. Not cop. Not citizen. No one.
Perhaps the tension this creates will make the police think hard about engaging in unlawful conduct, and potentially breaking the First Rule of Policing. Perhaps this will produce a blood bath, with the citizen invariably on the south side of a tank rolling north. The simple answer is for cops to stop engaging in unlawful conduct, but then, the police never seem to grasp why they aren't entitled to do whatever they please.