Aren't most of the people that are 'stuck' on Adobe stuck because they have a workflow that involves eg. full support for high-end digital cameras, asset management stuff like Bridge, full colour-matching support for high-end printing systems; and having it all work together well enough that it can reliably power media businesses from small to large? That's usually the functionality gaps that are not well-served by open-source alternatives, and what's allowing Adobe to price gouge and push unwelcome licenses through.

The issue is not that we don't have enough half-baked clones of the Photoshop UI where only half the buttons work. That kind of completely misunderstands why businesses are stuck on Adobe.