Danny,
For another company to produce the MP-1 would mean purchasing the patent and manufacturing rights to it, or at the very least, get licensed to manufacture, as I'm certain Dave Tarnowski still holds all the legal rights to his products. That's one.
The second thing is, so many of the components that were used to build the MP-1s, MP-2s, MB-1s, and Classics, have long been out of production, and some were proprietary. Plus, any established musical instrument companies would rather toot their own horn about their own products rather than build copies of anyone else's old products.
We at the ADA Depot are just a small voice in the choir, so I doubt if anyone would hear us. That's just my opinion. For someone to resurrect the MP-1, or an MP-1 styled preamp, would have to be a group of crazy tech-heads looking to launch their own start up company.
With the current trend in musical gear for guitar players, everyone is looking at pedals for all their tonal solutions, and many of them,(self included), are looking at amp-less rigs for gigging out. I know around here, most places won't even let you bring an amplifier of any size in the door these days. I loathe trend followers.