to be frank, I think the fact that they stopped selling products...well it did more than anything to put a dent in their sales.
What the A1200 was successful, though under spec'd, and even had a 2nd go of it, when released under Escom (by then it was even hopelessly out of date and still sold).
but what came after the A1200? to date, nothing....excluding linux ppc motherboards.
I will consider the next Amiga, to be the one that has OS 4 bundled....and I betcha, sales improve after they release a product people can buy. :-)