If Sony doesn't release a Playstation 1 mini or Playstation 2 mini, I think Nintendo will be the only very popular mini console maker.
Nintendo sold a lot of NES Mini, SNES mini, and other mini consoles. I think when Nintendo release the N64 mini, it would sell out because the N64 was very popular because of games like Golden Eye, and Super Mario 64.
The Nintendo Switch can also be consider a mini console because it is smaller than the PS4, and XB1, and the Switch has a lot of buyers, and was sold out for a long time.
Nintendo sold a lot of NES Mini, SNES mini, and other mini consoles. I think when Nintendo release the N64 mini, it would sell out because the N64 was very popular because of games like Golden Eye, and Super Mario 64.
The Nintendo Switch can also be consider a mini console because it is smaller than the PS4, and XB1, and the Switch has a lot of buyers, and was sold out for a long time.