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Modern road bike's BB are high enough to ride with clip and strap pedals, but when paired with a clipless pedal system, you don't need it that high.
Even on my bike with 255mm BB to ground height, I've still not been able to scrap the pedals on the ground, however clip and strap are an annoyance, so BB height isn't a problem.
As for 650b, the biggest issues is the chainstay clearance, fork are usually OK as they taper out the nearer to the drop out, even seatstay are massive (look at the Synapse carbon disc clearance).
The chainstay at its widest where the tyres is at, then get narrower before widen out again to the drop out (curvy chainstay), so you might struggle trying to get a bigger tyres to clear that section;
I have thought of this, but the Cannondale "SAVE" chainstay get in the way.
If you want to tackle the gravel more often, Challenge Strade Biancha is awesome for this, feel just as fast on the road and cope very well off road.
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edscoble
@branwen
An update on the CAAD 10 Disc. Taken it out on some proper gravel / sand / fire roads last night and this morning. Happy to report that it's not put a foot wrong with 28s.
I also, mostly for a laugh, stuck a 26" wheel on the front. It has clearance for a 1.2" tire then. Would drop the BB a bit too much though I suspect. Has anyone tried a 650b wheelset yet? @edscoble ?