Basically my options if I don't want top pay a license fee for forever is to find alternatives, or pirate the software. I've opted for the former, but either leads to Adobe getting $0 from me, where they could have gotten >$0 if they had had a "pay outright" program.
I have generally found good enough alternatives with their competitors (Toonboom is generally good enough for basic animation, Krita is good enough for artsy stuff, Final Cut Pro is good enough for video editing).