Their long term concern is that their work on rustc will be undermined by the same people who pulled these shenanigans. Which is a pretty bad situation, and might result in a fork.
Nobody working on a language/framework of that size is easily / successfully forking. It is a dead end if the politics do not end.
And the threat of a fork is politics again
Forks do often end up having the effect of removing the person(s) who were roadblocking progress in the first place...as the compromise solution to the fork of the project.
I don't know if you've tried to record a talk to benefit people who have just thrown you under a bus, but I've tried and failed. I too would love to see that talk but I wouldn't expect that of JeanHeyd in this moment.