In reality if anything it's the ad exchanges that need to be taken away from Google
... because currently Google is present both at the supply and demand side of ads, and has (near-)monopolies on both sides, which obviously gives them not only a chance but also incentives to manipulate the market, which they do. They also do it when their Chrome browser blocks certain type of ads which Google judges not to be preferable, or when Google Search ranks pages higher or lower depending on what kinds of ads they're running.
Now obviously you can't force Google to not show ads (or if you did, then you'd have to do the same thing with every other vendor company), so, the only solution to resolve that conflict is to remove the other side from the equation, and take away their ad exchanges. This will force Google to compete for the ads like anyone else does, and will not allow them to manipulate the ad market (or at least to a lesser degree) than currently in their own favor.