Elaborating on the per-hour usage concept -
The concept of paying for s/w usage on a per-hour basis could very well revitalize the anti-piracy movement.
You want to use Photoshop? Fine, sign-up, add funds to your account and get your hands dirty.
As soon as you run out of funds in your account, the service saves your work, emails it to you and asks whether you want to renew your access.
You could very well refuse to do so and take your business elsewhere; you still have the original files.
Now you're not only using legit s/w, you're also free from the humongous cost of licensing such s/w and you have no need to cross over to the dark side.
Of course, you could just switch to freeware/open-source but I reckon if given the opportunity to use commercial s/w that is polished and user-friendly, people would be willing to pay for as much as they use.