CS6 doesn't even have a scheduled launch date yet, so there is time to adjust - people would still complain no matter how long they were given to "adjust".
The tenor, volume, and amplitude of the complaints would be much different.
"Hey CS4 users -- about the CS6 you thought you were saving yourself for: You can't have it. Sorry, but you will be singled out as losers in this game, just so you know how little we care. Console yourself with this PR campaign, which is designed to make you feel like you will be a winner in the end with cloud computing."
That's a much different message than the message that begins "Starting with CS6, we will be changing our pricing policy."
Nevertheless, I hope they rethink this. I do not want another "cable bill". I do not want to subscribe.
Personally, I think Photoshop is an archaic beast, and long overdue for a complete redesign. I think they should take a cue from the video industry and get with the dataflow model. A well thought-out real-time media engine and a dataflow programming model can implement every capability they've ever had, and then some.
If 1M photoshop users put up $500 next year, instead of sending it to Adobe, we could create the next generation of photoshop from the ground up. Occupy Adobe anyone? :-)