I think they can back to the roots and make a Neo Geo FPGA (I think it's doable with current FPGA chip Analogue use or a double fpga setup as Pocket). This in 2022. Until there maybe the prices comes down and can be viable to use the same chip as Mister (115k LE if I'm not wrong) and enable Nintendo 64, PS1, etc.
At least an Arcade FPGA defeat their "legal" vision:
Analogue Duo does not play copyrighted ROM files, it plays legacy game cartridges and CDs.
They can put a floppy drive to make a classic computer fpga compatible with originals games but I don't think they will do it.
But I hope that increasing the engineer dept no only allows they will able to run 2 projects at same time but could also update previous works. Also have stock of their products would be nice. I miss the time when we complaim about the higher shipping costs but there was something to ship to us...
About third party support nothing was said about Duo. My guess it's a Pocket only thing because the pocket is like the Zimba 3000 portable edition. I dont see an updated pocket until Nintendo DS or psp are doable in FPGA.