Everyone believing that Sony will, (technically it's possible but 99.9 percent unlikely), do a dual GPU need to understand that's pretty ridiculous.
Please consider what I stated before in how unlikely it is for practical reasons:
It's way less cost effective by alot than doing a big GPU. It produces way more heat, especially per watt in regards to efficiency because Crossfire, for example, is dual but only gives about a 50 percent performance increase and has not been important for AMD to improve:
https://www.techradar.com/news/nvid...-is-dead-but-should-we-mourn-multi-gpu-gaming . Sony would have probably an insurmountable hill to climb to cool it with a console's form factor and power budget, especially what's being dreamed of in fanboys heads(Dual 36...72 GPU). If they wanted a higher performing gpu it'd make a hell of a lot more sense to just make a bigger one....that would still have all the problems mentioned but not to the same level as a more expensive, lesser performing crossfire setup that's hotter, less efficient, with a dual GPU setup. In the PC space it happened because you can get a 1000 watt ps unit, large case, various options for cooling and an "unlimited" budget. The dual GPU dream in a console is asinine on many levels.
Sony would have done a "big" GPU, no way in hell would they do a dual GPU, possible sure but world ☮ is also a possibility.