Agreed. If the GH6 had been released in early 2019 with 6K or even 8K, it would have carried some weight and continued the trend. As it was, Panasonic went down a different route. Each GH release carried something new that got people excited for MFT, but it will be hard for a GH6 to get the same level of excitement now. Though with the S1H out there, it's no longer going to be Panasonics flagship hybrid camera, so probably won't have to be the big launch previous models were.
If done well, it could keep the MFT line going for another 5 years. It's whether Panasonic will want to do so, when there are advantages in encouraging current GH users to shift to their fullframe brand and spend money on a new lens system. MFT still has its uses, and is great for light and low profile lenses, but with Olympus gone, it feels like format dying slowly from neglect.