Switching an engineering firm from one software to another is extremely costly.

I also thought of a class legal action but, I suspect that Autodesk looked at the script and found that they have the legal right to forcefully expropriate, without compensation, our perpetual rights to software that was offered with a promise of continued maintenance.

Yes, Autodesk is aware of the cost of switching software.

I'm betting their highly compensated legal team would be able to handle any legal challenge, and that this was all considered years ago.