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You may be right, i just can't picture a ball bearing ever cracking. Also there won't even be any real force on the bb unless the thing holding the wheel in place slips which I've never experienced even with a quick release, never mind a track nut!
tbs-
Rear track nuts slip under the force of pedalling all the time. Over the last few years I've cracked a few steel components including crank arms, chains and a seatstay. Not to mention the stuff I see come into my worshop..
You probably wouldn't notice a quick release slipping because the wheel axle should already be sitting snug in the top of the dropout already. Quick releases in vertical dropouts often suffer from slippage after a while.
psg1ben
I haven't seen those spacers so can't say for sure but I imagine they fill the space out rather than concentrating all of the forces through a small point. People brake bigger parts. Given the thickness the bb has to be to allow the nut to fit onto the dropout it probably wouldn't be up to it. I mean, I suppose you could get away with slower/smooth rides. I wouldn't want to ride through London potholes on a regular basis like that...