I had a A4000 with 030 and Picasso graphic card and sold (with huge losses) when I got my first PC (including lots of software) and today regret it too...
Of course it has to do with "nostalgia" but that is not the whole story. I am self-employed and have the "fun" to do support/network for some customers on the different versions of Windows and I like "Amiga" more every day because of that :-). It is not that the times were "simple" back then but the system and concepts were. And in many areas AmigaOS was far ahead of competition (f.e. installing drivers by copying files). I think there is at least a chance for the platform but of course it must be "Amiga 2.0" so to say. It will certainly not a revival of 68k as a mainstream platform but 68k will play a important part in it, not just because of nostalgia (f.e. playing old games) but because of the huge distribution chances with UAE running almost on every system today including mobile devices. That is my "dream", not nostalgia but a revive of the platform as commercial market (of course much smaller than Windows or Linux or Mac but big enough for commercial indy developers). I do not think that this is "nostalgia".