i saw a pair of DA track cranks, ridden on the street with matching BB, that had serious wear in them.
i think the issue is that octalink- incl. the track DA's- wasn't intended for skidding. (then again, neither was any other kind of bb/crank). because of the shallowness of the spline and the unanticipated two-way wear (front and skidding), the spindle wiggled a wear hole into the crank.

this is prolly the basis of the rumors about octalink and fixed.

i don't think it should be a problem, just keep an eye on 'em, as you would any component, to anticipate wear.