I understand that you are upset, you have made that very clear. However, I disagree that Autodesk has mistreated you in anyway. Technically, you haven't lost anything. You still have the V7.7 license you originally paid for and no one will be taking that away from you. The subscription change only applies to Autodesk EAGLE, so you still have exactly what you paid for.
Autodesk does care about it's customers to do othewise just doesn't make business sense. The improvements in EAGLE are a testament to that, the fact that I'm here replying is also testament to that. EAGLE feature wise is far more powerful than it's ever been and all this has happened in less than a year. I know you've been copying issues from the Autodesk forum and posting them here, however you haven't been following up on the resolution of those issues. When Autodesk EAGLE first released it's stability wasn't what users were used to with V7 and prior. On the flip side, there wasn't as much change in EAGLE's codebase prior to Autodesk either so stability was easier to preserve. With that said many of the linux issues have or are being ironed out and every release is better than the last in terms of stability(I run a Linux Mint 18 box with MATE 1.14.2 desktop here). I think there is large Linux market that is a unique opportunity for us to capitalize on, since no other commercial tool natively supports linux(keyword: commercial, KiCAD and GEDA are not commercial entities).
Never say from these waters I will not drink. I haven't heard anyone say they have actually tried the latest 8.1.1 here. You may discover that it's not what you thought it was. EAGLE's file format is XML so you are never truly locked in as can be seen by all of the converters available in other tools. You really have nothing to lose by trying it and then forming an informed opinion.
Just my 2 cents, if they are even worth that much. If you try it and run into any problems I'm here to help.