So while today's 18-24 year old "hardcore gamer" may not know the Amiga, it's nice to know that developers still do.
I think that, at least in the UK, you'd be hard pushed to find a coder or artist who's been in the industry for more than 5 years who doesn't at least remember the Amiga.
However it's a 12 years or more now since the Amiga was worth developing for financially so most of the developers who have worked on the Amiga in the past are now well into their thirties and as the younger guys join there are fewer and fewer people who remember.
I've seen Amigas being used as recently as 2002 (using DPaint for drawing sprites for GBA) but that was very rare.