Yes you are right this is probably the final chance for the Amiga,
Well now, that is something I can agree with you on. If the A1X1K is a financial-commercial failure, I can't see too much of a reason for OS4 to carry on. MOS is picking up sales with old Mac hardware, so there is a minor cash flow as incentive to carry on. I can't see the same for OS4, even SAM460 sales will most like be going to existing (although I will be an exception) SAM440 owners wanting more power.