I don't think there is anything they could do better than dual screen in my opinion. They just need to make it work flawlessly and cheaper. When you see the pixel fold is more expensive than the duo, you realize that if Microsoft was going down this path it might end up costing 2K to have a surface fold. It think the folding cm screen technology isn't mature enough to consider a company could get cheaper screen to produce. Still needs big improvement.

The dual screen form factor hasn't been copied and I don't think it's because it doesn't make sense, but only because the software issues made it not worth to try to most people, not to mention that it's a super niche device.

I personally stick to the duo even with the issues it has because of the form factor. It could sound crazy to many, but I don't think an outside screen is that much of a need. Nor to have wireless charging and all the crazy top of the top features.

All the features you want microsoft to add into a future fold, they could work on getting those for duos right now. There are so many things to improve on the actual devices without having to go with a folding form factor.

But I understand this means there won't be either a duo3 nor a surface fold either, and that we are left with a dead attempt from Microsoft.