I doubt whether B&W film can match todays sensors in D-range. It may feel like that, but shadow is very dirty on negatives. With a D800 you must measure light differently and shoot at the highlight clipping point.
Also the archiving of film is much harder. To do it good, you need conditioned rooms, lots of space, where a 3 fold hard drive storage is refreshed every 2-3 years as you migrate to larger drives. And you store in 2 or 3 locations with ease. With film, you never can make exact duplicates, so hurricane or fire means archive destroyed.
I don't disagree with your last point; both digital and film have their own unique challenges regarding archival storage.
Re: dynamic range, B&W negative film can have 18-19 stops of DR (T-Max, for instance), with most of that coming in as highlight retention. Which is why the old adage is true: expose for the shadows, develop for the highlights. You do this knowing that the highlights will hold many stops of overexposure, and boosting the exposure of the shadows vs. where they will ultimately be printed means that they will also retain detail. Newer C-41 films like Portra 400 has 17-19 stops of DR, again with great highlight retention. Ektar is an odd duck, with noticeably lower highlight retention than other modern C-41 films. I refer to Ektar as having all of the drawbacks of reversal film, with none of the advantages. I still manage to put a roll or two of it through my cameras every year, though.
DxO Mark, which is notoriously Nikon-centric, puts the D800 at 14.4 stops of DR.
So negative film still has the advantage of a far greater overexposure latitude. On the other hand, if you underexpose negative film, it's going to be a horrid mess, while the D800 deals with underexposure with no problem; in fact, one could argue that it makes sense to underexpose slightly with the D800 (given that there is no latitude for highlight clipping on a digital sensor, and the noise performance of the D800 is so spectacular...all of the D800's DR comes in the form of shadow retention).
None of this applies to reversal film, of course. I see no reason to shoot 35mm (or even MF) chromes in 2012; the DR of FF or MF digital is easily better than any chrome on the market, and the cost of E-6 film and processing is becoming exorbitant (if you can find somewhere to process it, or even if you do it yourself). Large format is a different story, of course, since there are no feasible LF digital systems available, besides some crazy-expensive scanning backs.