If you use a proprietary format and don't archive the executables to read them, it's simply not reasonable to expect such an archive to last 14 years. Nothing to do with this TOS change. You should have taken action when they started with the subscription model and creative cloud thing. People have been warning about this.
But what were you supposed to do right? Use some software with the eraser in a weird place??
I have a lot of old AE projects I sometimes need to modify for clients, so I need AE for those.
Since I can create the same titles/animations in Apple Motion in a fraction of the time that they take to create in AE, I use that for all newer projects.
Also I have 14 years of prior projects that I sometimes need to reopen, so canceling just isn't an option.