I don't doubt your contrariness. I think it's wishful thinking that he will be so easily exploitable (have you seen the cell phone commercial based on this?). He may bluff his metacontrariness, but I'm willing to bet he'd be making a play. If a true metacontrarian child came along, I think the universe would suck itself into a tiny little ball and go *poof*.
A friend of mine in college was a college Republican and International Business major, with a minor in Japanese. His parents were pretty danged hippified, and dad was a crossdresser, last I'd heard. Also last I'd heard (which was as we were graduating, lo these many years ago) he'd married a bisexual girl who was interested in exploring polyamory (in some form or other). He was also one of the first people I did some SM exploring with, way back then.
Me, I turned out pretty much like my mom. Not exactly the same choices, but some really similar thought processes. Very similar physical appearance, and I can mimic most of her mannerisms both physical and verbal/vocal. My dad once mistook us (from around the corner) when I was 12, and when I was 16 or so, a close friend of hers mistook us from about 15 feet away at the mall. I guess my rebellion was to not turn out like either of my grandmothers or so much like my father.