Well, in an ideal situation, it shouldn't break. Of course, if the bushings bind up on a stock bar, it will do the same thing. Any time you upgrade something, you run the risk of breaking something else, so... the way I see it... if you want to upgrade and be part of "the game" then you have to pay the price if something happens. Rough roads, big bumps, etc... those will assist in breaking one of those brackets. I never had a problem after I used a generous amount of grease on my bushings and bar. I popped the 3 on my car within a month.
Without it, you'll push like crazy and the car doesn't handle anywhere near as well. Feels more like a Honda than anything else.