Many years I asked a very wise person: "what would happen if adobe port photoshop to Linux?"

The answer was "nothing". I asked why; the answers was: "no Photoshop user will migrate for Linux because of it, no gimp user will migrate to Photoshop".

Also, I've read in HN once: that are more people using Linux on the desktop than there are Photoshop users. People overestimate photoshop as a killer app.