I would love to see this too! By the nature of the flash roms being soldered onto the board, would it even be possible to do a multi without creating an entirely new PCB?
Honestly, I think a CV1000 would be such an epic achievement. Even the least expensive CV1000 games are in the $500+ range nowadays. The most expensive titles are not even available should you even have the desire and resources to fork over thousands of dollars for a single pcb. The most recent game is over 5 years old at this point. CAVE isn't selling it anymore, they don't seem to have any hardware left. You can't even find it at PCB shops in Japan.
Sure, some collectors would probably get upset if a CV1000 multi were to be released, but that happened with CPS2 as well. I think there's been enough evidence in the retro game markets that multis and flash carts don't devalue original games. Besides, I have a hard time finding sympathy for collectors who just want to protect their "investments" . CV1000 has so many good games and so many variations with the revisions, black labels, etc. Even at $1k for a multi it would be a bargain.
Back to the subject, BIG THANKS for this F3 multi, Darksoft!!! Whatever you decide to produce next, I'm sure will be awesome.