I fully understand where the question was coming from. I just dont think its practical to spend 6K on a device that is primarily used as a player of high def files not stored on BD disks.
On the contrary, the usefulness of an NMT is unchallenged for its price range. The functionality is also quite utilitarian, if you ask me. People are just looking for ways to make the most of their gadget, I guess.
If I were to spend 6K on an accessory that cannot be used as a standalone unit, then I would rather save more money and get a BD player to have more reliability, as well as flexibility especially in terms of simultaneous viewing or usage at different rooms in the house.
The premise discussed is really not to build a BD player off of an NMT but to see if this functionality can be leveraged as a value-add. IIRC, the aim was really not to create an out and out BD player but to see if this functionality could be a possible spin-off.
Maximizing the capability of this particular device is not necessarily practical - me thinks.
It would be practical if somebody already had an outstanding external BD/HD DVD drive that connects using USB; instead of ditching it or letting it rot in your attic, why not connect it to the NMT and still make use of it? It would be a totally different matter if NMT owners would encourage each other to scrounge around looking for BD ROM drives. And btw, if this functionality is available, a BD-ROM drive addition would most certainly be a welcome surprise to many an NMT owner.
Disclaimer: I do not have an NMT.