Just a few things that I'm thinking about.
Whyte PRST-4.
It's a radical design. Not just the looks of the thing, but the fact that it's a proper monocoque as opposed to a bunch of tubes that are welded together. There's also the racing pedigree thanks to Jon Whyte's link to F1 suspension design.
Acros A-GE shifters.
They're rare and expensive now, but also a lot lighter than anything else out there.
Unfortunately they require modifications to the frame and aren't installed by default on any bike I know of.
Then again, those things didn't stop the Shimano Airlines kit from being hugely expensive nowadays.
First generation RS Reba (2005-200

.
Just about the best suspension fork you can get if you have a bike that uses V-brakes. Modern forks may be getting better, but they don't have canti mounts anymore. The paint on them isn't too good, so good ones will be rare and in demand in 10 years time.
With regards to XTR, any modern XTR set will be worth something in 10 or more years if it's NOS. However a current XTR set is quite expensive already, so I have my doubts regarding the profit margin.
Also, an M980 is nowhere near as durable as old versions. The cassette will rarely last more than 2000 miles, even if you have 3 chains and rotate them every few hundred miles to save the cassette. An M900 or 950 cassette and chain will last tens of thousands of miles if maintained properly.
I really doubt people will want to spend huge amounts of money on a early '10s XTR set that wears out this quickly.
Then again they're spending that kind of money on them now, so you never know.