By MSFT's own numbers (can't tell you how I know) the "professional graphic market" (whatever you want to interpret that being) is -STILL- about 60/40 Mac ...I don't know the exact pro photo %, but it's prolly more like 50/50 or possibly 60/40 Win. I don't know exactly what Adobe's platfrom % is, but given a lot of "prosumers" (who tend to be Win) also buy pro software, I'm pretty sure that Adobe is more like 60/40 to 65/35.
Those are the realities, but for the sake of this discussion, not really all that important. Adobe ain't about to leave any market that has important revenue, so Adobe will keep making software for Mac & Windows. It's pain to be so platform agnostic, but that Adobe's position...