Actually, the 2600 still has a lot of fans, since we just got the Portable Flashback and Flashback 7.
They wouldn't keep making it if it didn't sell. Just look at the Intellivision and Colecovision Flahsbacks (both one and done).
And we still get compilations for new systems.
Now outside the 2600 stuff, the general public doesn't seem to care much about the Lynx, Jag, 7800, 5200 or computers.
I'd say the retro systems that a lot of people still care about are:
Atari 2600
NES
SNES
Game Boy
Sega Genesis