AMD should make a 2000$ GPU's for the consumer market like NVIDIA.
500-600W is tolerable for the absolute performance at the top tier they would need to have.
Those who can't afford them buy the lower tier 1000$ GPU @ 200-300W instead.
There is absolutely a market for these expensive GPU's no matter what people say that can't afford them.
There are enough people that can afford them to make them viable.
The problem is that 600W is too much, the RTX4090 was designed for 600 W. According to problems with the manufacturer, the cards were produced in a smaller manufacturing process and therefore the RTX4090 only need 450 W. and the AMD RDNA3 cards were not as good as AMD predicted, not bad, but also not at the point they wanted. An AMD 600W monster could beat the RTX4090, but it can also happen that this is not enough and that would be so bad for AMD.