I think there's zero chance of Adobe giving up their monopoly. They already have some apps in iOS (mostly geared towards the iPad Pros), and they will almost certainly support ARM Macs. The lack of bootcamp doesn't necessarily mean a lack of gaming. In fact, iOS is one of the most supported gaming platforms, so I can see even more games being available if Apple creates a hybrid OS. I think your third point is a given. Rosetta was a nice bridge, but it wasn't particularly good at emulating PPC at full speed. This will likely be the case again, where we'll have universal apps during the transition but also some emulation layer in the new ARM Macs that allows users to run their old programs until Apple drops support completely.