And while I did agree that a C65-like machine would have filled a gap in the market, that isn't what you were claiming originally; you were saying that a C65 would have rendered the low-end Amigas unnecessary.
Let me clarify: it might have reducing the pricing pressure that resulted in the low-end Amiga models that we actually received. The A500 and A600 would no longer have been Commodore's entry level computer models. And as such, with more upward flexibility in pricing, they could have had better specifications. In particular, the A600 might have come with a faster processor, more memory and a full keyboard.
But I doubt that it would have been as good as the Amiga if it had morphed, piece-by-piece into a 16-bit system, and I doubt that system would have worked out any cheaper than the Amiga 500 by the end of the decade if it was comparable in power to the latter.
Perhaps. But one reason why such a series would remain successful would due to software momentum. Remember, Commodore's super-budget computers were really popular in places like central Europe. If the Amiga doesn't have a large base of software written in Hungarian, but the 8-bit series did, do you think that they'd be more apt to purchase a used A500 or a new C512?
Remember, the PC-DOS market didn't survive because it was the best platform. It survived because it had a lot of programs you couldn't run on anything else.