As a fairly longtime Amiga(and everything else) owner and sporadic user let me welcome you to HOBBY computing. The Amiga is a computer that WAS ahead of its competition at various times but poor company management doomed it to a footnote in computer history.Sales were tiny compared to Playstation and other video game unit. Yes 5 million or so Amigas were sold;in contrast to 15 million Commodore 64s and 128s.By the way the C128 is another computer whose potential was never really utilized by most programmers or users. There are still people enjoying those old computers .
Every obsolete computer will still run all the softaware it did before and as well;it just won't run the NEW software as well,if at all.
Keep in mind that IBM compatible computers are in nearly every business,home,school, and government office, and 50 million new units a year is likely the figure.
I just realized that I've recently spent way too much in a bout of nostaglia for Amiga stuff.
I am of the opinion that, unless Amiga OS4 can be licensed and released as an alternate OS for existing IBM-compatibles and Macs, Amiga user are most similar to antique car enthusiastists,steam engine fans, and others.That is,of passing interest as a harmless hobby but sort of "odd".
In its time the Amiga propelled a lot of video which the public enjoyed but neither knew nor cared on which computer ithat video was produced.The classic Amiga Toaster is about to become less relevant with the forced transition to new digital TV standards so the main niche is fading fast.
You may develop fine skill at programming the Am,iga ,and enjoy it. just don't expect the Amiga to become a blip on the radar screen of the real world.