All of this is true, however it can be solved one thing: "customer" satisfaction. Especially in the age of Yelp, Angie's List, etc., word of mouth is a very, very powerful thing. If you're a practice that rips people off and attempts to bill for unnecessary procedures, you will develop a poor reputation and "customers" will stop seeing you if they can avoid it. If, on the other hand, your patients are satisfied with your service, are comfortable around you, and get the sense that you truly care about them (rather than strictly the bottom line), you will develop a good reputation and patients will flock to you.
What you worry about isn't limited to corporations/integrated medical providers. A douchebag physician is going to be a douchebag physician no matter what practice environment he's in. There is nothing intrinsic about large-scale medical practices that causes them to be terrible. As an example, see Mayo. If you think academic institutions or other practice setups are immune to this, you're sorely, sorely mistaken.
I recommend that you set aside the 10 minutes it takes to read the article. It's about, you know, your future career and all.