What are they gonna switch to? I'll bet it ends up being a fork of Zoom or Teams. It's all just theater.
I’m guessing they will probably use something built on top of Matrix which is an open protocol maintained by a Community Interest Corporation (CIC) in the UK.
https://www.theregister.com/2025/10/30/france_matrix/
I’m less sure what they will use for video conferencing, but they could do worse then something built on top of WebRTC, which is also an open protocol maintained by W3C, an international standards organization with location in 4 countries (including France and USA).
Some clients use Jitsi, but I find it more complicated to run Jitsi in-house. BBB was really easy to setup.