Companies have seen though that they can get a lot more reach through video even if attendees are far less involved overall. I do think we'll see the presentations mostly being done in-person though. It's still more hybrid in that regard right now but in-person attendees are mostly not going to watch videos.
FOSDEM was (and is!) accessible without a reservation, without handing them your personal details. They were an example before I was ready to understand the importance.
I hope they will be able to "get back to normal" next year.
It sucks, but I understand and fully support the FOSDEM staff's decision to go virtual for 2022. I'm saying this as someone who has been going to FOSDEM since 2012; and as a co-organizer of one of the Dev Rooms.