Murray,
From a theoretical viewpoint:
What makes storage of any multilayer colour film more critical than that of b&w film, is that at least three layers are involved which form coloured sub-images. Storage induced deforming of the characteristic curves of those layers up to a point where they not longer are parallel cannot be corrected by filtration.
Well, if you make a chromogenic b&w film based on a one-coupler system (delivering a monochromatic image in the true sense) or use a mixture of couplers (delivering a net grey image), in both cases there is no triple system involved.
Though, there might be other storage issues involved too.