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.
Multi-chip GPU design will allow performance to scale to unimaginable levels as cooling will be less and less of a issue for the chip as they can break it up into smaller dies.
Power consumption can reach 1kw area if they really want to push the limits with a 2-4x chip design for GPU's depending on how powerful they want to push each chip in the multi chip solution.
2x GPU's gonna be the most likely solution and reaching 600W with those would not be that hard to do if they went with dual 7900 series core design as a first solution.
The professional tier cards could see 4x or more design to come quite quick.