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@edscoble
Fork need to be strengthened to compensate, as well as the rear triangle, it also mean that the fork may not absorb the road vibration well due to the way the disc mount is brazed on as well, a good illustrated example would be the fork from a Tout Terrain touring bicycle to address the problem of the fork blade flexing under stress;
You also need to have a higher rake angle to compensate, something that's not really possible with the 650B Randonneur, especially for a front handlebar bag.
If you use normal thin walled tubing with a disc tabs, this will happen;
I have a fork made by Ryan for my Tokyo Fixed bicycle to put the bicycle at a correct angle, I was surprised by how comfortable high quality well made steel fork are, I can actually see the blade flexing at high speed going down a rough road in the Pyrenees.
Personally, centerpull, especially brazed on one are pretty powerful and reasonably light for a long reach one with ample room for both 42c tyres and 60mm mudguard, very easy to fix and adjust compare to cable pull disc.
Having a disc equipped CX bike already, I can see the appeal and I loved it for its strength, but the small advantage isn't enough to outweigh the disadvantage I've mentioned above, the majority of advantage are usually through deep water, muddy condition and obviously offroading, I've thought about it and decided against it especially as I plan to aim for an average 9.5kg fully equipped.