This warning only applies to the subscription CC version. The perpetual Creative Suite and other stand-alone licenses are, as Victoria says, are not affected. You can use PS 6 until you die!Are you sure? Victoria Bampton (The Lightroom Queen) wrote "perpetual licenses are all still authorized exactly as before. This change only affects subscriptions".
I wouldn't be surprised anyway if Adobe tries to take advantage of some FUD to sell more subscriptions.