Not a lot. At FOSDEM (at least for the last 10y, I have been attending), you have four kinds of talks:
* Lighting talks/short talks: Most of the time, you may not have Q/A if the speaker talks too long but you can catch they off stage to talk about it. So you keep the live aspect.
* Big/Popular talks/Main roam (Janson): You don't ask Q/A during those presentations so it would not change a lot.
* Mid-sized talks/roams: It depends on the speaker how much interaction, he wants.
* Tiny roams: There you will loose the jokes and the fun going on with well-know speakers in their communities.
I think we will see less informal/fun talks because the streaming format does not easily allow the spur of the moment joke/question. The quality of the speaker will really during those Q/A moments but on a time management side, the good news is that you have less time-keeping to do with a prerecorded streaming event if each talks has his channel.
* Lighting talks/short talks: Most of the time, you may not have Q/A if the speaker talks too long but you can catch they off stage to talk about it. So you keep the live aspect.
* Big/Popular talks/Main roam (Janson): You don't ask Q/A during those presentations so it would not change a lot.
* Mid-sized talks/roams: It depends on the speaker how much interaction, he wants.
* Tiny roams: There you will loose the jokes and the fun going on with well-know speakers in their communities.
I think we will see less informal/fun talks because the streaming format does not easily allow the spur of the moment joke/question. The quality of the speaker will really during those Q/A moments but on a time management side, the good news is that you have less time-keeping to do with a prerecorded streaming event if each talks has his channel.