You are not alone. I have encountered the same issues on my MacBook. Having had many experiences with lost time and lost work due to Fusion, I decided to put my electronics design work aside for the rest of yesterday and tackle the issue again this morning.
Here is what I did ...
First, I sent pretty much every error report to Autodesk. There must be more than fifty at this point.
Second, I attempted to follow the instructions posted above, but the pop-up from Activity Monitor does not display the path to AdSSO-v2. Instead in a terminal window in the / (root) directory I typed this command:
find . -name AdSSO-v2
I then renamed this directory and restarted Fusion. I had the same problem and was again flooded with error reports. But I did notice that Fusion slowly started up so I decided to wait it out. When it looked like Fusion had successfully started, I force-quit AdSSO-v2. This put an end to the error reports and Fusion seems to be OK.
I am able to open design files. I plan to work on what I should have completed yesterday, but will save my work even more often than usual.
At this point my MacBook fan is running like crazy due to the excessive CPU load caused by AdSSO-v2. It should slow down eventually.
As far as petitions go, I don't think it will matter. I believe that the Fusion team's heart is in the right place with trying to continuously improve the product. However, the absence of a formal method for vetting new releases while allowing users to remain on the existing release until new releases are stable is a big issue. I have taught and managed agile (or continuous) development for many years, and moving fast is not an excuse for moving without appropriate discipline.
I can only hope that the Fusion team understands the need for a formal alpha and beta program that proceeds the fanfare of "Here is the release you have all been waiting for." My current feeling is that I dread each new release, bracing myself for a whole new round of bugs big and small. I suspect I am not the only one who wishes that AutoDesk would leave Fusion alone long enough for me to complete my products!