If I had to pay even $9.99 a month for the Photoshop 7 I have now, I'd be WELLLLL over what I did pay for it. 10 years x 12 months x $9.99 is $1198.80, well over the $350-$500 I ended up paying for it. And, as I said, it still serves me well, but then I use it for me, not some graphics design company.
Oh, and CS6 STILL wouldn't work on my XP laptop (processor is too old).
Commercially oriented companies MIGHT come out ahead in the long run with the subscription model, as they can diversify those costs amongst their clients, but for an average Joe like me, well let's just say GIMP is looking mighty tempting if Photoshop 7 ever lets me down. It hasn't so far.
You can keep Adobe's subscription model. As for me, I won't buy another Adobe product until they at least offer a standalone one time purchase version.