As much as I would like to see that...I honestly think that's just a pipe dream.
While making a RR deck isn't absolute rocket science...there are still certain technologies, craftsmanship/experience and knowledge that are needed...and most of those guys are out of it, retired or dead. Plus, making a few machines is pointless, and would not be worth anyone's time or investment...so why would anyone bother to dive into that venture...
...and the need to make large quantities doesn't exist.
There are some guys modifying and cobbling stuff from existing decks...thgouh that's at the higher-end, where there are customers willing to still drop serious $$$ on a super modified deck....but someone making brand new decks, starting up a completely new production line....mmmmmm....that's a long shot, IMO.
I would be pleasantly surprised though...so I hope you end up being right!
They won't likely be made again. The original multi-tracks would have to get to the $10,000+ level on the used market for such a thing to even be considered. Home recording has put the 'studio business' virtually out of business, which means there is no market for new 'studio quality' decks.
Home recordists rarely owned 'Pro' recording gear in the '60s-'70s. Studios leased large decks and paid them off as they made income from clients. They cost more than a car or a house. This industry was nothing like it is today.
It wasn't until the Teac stuff came around that regular folks could even think about mutli-track recording.
Some food for thought:
Scully 280 2-track cost, 1970: $2,890.00
$2,890.00 in today's dollars (adjusted for inflation): $16,043.37
Scully 284 8-track cost, 1970: $12,450.00
$12,500.00 in today's dollars (adjusted for inflation): $69,391.75
Scully 288 16-track cost, 1970: $24,950.00
$24,950.00 in today's dollars (adjusted for inflation): $138,505.94
--
Teac 80-8 8-track cost, 1977: $3,500.00
$3,500 in today's dollars (adjusted for inflation): $12,444.39
I could potentially see something like a Chinese-made 388-type deck if the demand is high enough ... but the days of the big boys are over.