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You've probably got it there, I didn't spend much time or money on cables and gave up on them pretty quickly. It seemed I was constantly adjusting for pad wear and they never really stopped me much quicker than well-setup cantilevers.
I reckon the big advantage with discs on cyclocross bikes comes outside of racing, I could have done with a pair when riding the south downs way: steep, loose descents with gates at the bottom are not ideal for cantilevers.
I haven't clogged a frame up around the brakes with wide stance cantilevers and a high straddle, it's always around the bottom bracket junction for me.
I've never actually tried drop bar hydraulic brakes, just had bad experiences with bb7's, so I'm not dead against them. The hydraulic brakes on my mountain bike are great, so despite my previous statement I would consider them. It'd just mean two new wheel sets as well as a discs and a custom frame. Not going to happen anytime soon anyway.