But all of that media can’t really replace the socializing, networking, and simply fun that happened as part of (or sometimes despite) the conference formula.
I don’t know how to fix conferences, but the first place I’d start on that whiteboard is by getting rid of all of the talks, then trying to find different ways to bring people together — and far more of them than before.
I no longer go to many conferences, and that is a good thing. But fixing them is a problem, not least because many academic conferences are businesses that collect money that supports other activities. This is not always bad, but is often not good. ‘Getting rid of the talks’ is of course attractive. Leo Szilard once suggested that you should stand up, briefly report your conclusions, then sit down. Only if the audience were sceptical of your results would you have to speak for longer. As for size, there is no single right size. However the best conferences I have every attended were all small, with less than 40 people. But I wouldn’t t have got to these small ones, unless I had gone to the big ones.