Question is, how are they gonna know if someone is using a previous version of their software? I dont think anyone is gonna say "hey Adobe- I'm using Photoshop CS2!"
What is forcing a lot of artists hands is the fact that Adobe is doubling the price of their Photography package(that included PS & Lightroom) from $10 to $20. I picked up that package coz I could afford it; truthfully/technically I can still afford $20, but it's the principle- if they raise it up to $20 and they see people are paying, they'd probably raise it again in the future...greedy f**kers.
My PS subscription is up for renewal at the end of September/October...if they are talking about a price increase, I'll just end it and find an alternative. I have CSP, so I'm good...