(Interpretation of that raised eyebrow: text isn’t hard to mess up. It is nonetheless more accessible in general, I just couldn’t leave the “text is very hard to mess up” unremarked on.)
Edit: or have I completely missed the point of what you're saying!
Consider that there was a time not so long ago where the vast majority of people didn't know what LOL meant and would be confused when encountering it. On the other end you could probably copy some heavy British slang in here right now and I would be very confused.
The fact that it was open to several additional interpretations merely suited my sense of humour.
Giving a presentation though there isn't such an incentive and the goal is more explicitly to explain your idea rather than to prove how clever it is. So I find presentations easier to follow in general (unless they are a bad speaker, of which there are unfortunately many).
I always fantasize about a collaborative app that would blend a few smartphone audio recordings to cancel noise and room reverb into a nice vocal signal.
The bigger trick would be getting various parties at any given event to help out by first recording and then submitting their data to the same collaboration service. I've seen enough rooms full of techies struggling to get a projector or conference call working to imagine all kinds of headaches with connectivity, app installation, finding the right event reference, etc. If you allow post-event submission, most people would probably forget or not care by the time they got back to their home networks only to be annoyed weeks or months later that they still have a large audio file taking up space on their device.
As more people are posting various captures (just for personal-reasons/vanity, without necessarily going out of their way to prescribe any particular remix), maybe something like PhotoSynth where you crawl the web for media having similar GPS and timestamps could work. Maybe people could be bothered to tag their posts with hashtag #YetAnotherCon2017; then you just have to monitor a couple of the more popular social channels.
About cooperation, I'm sure it's not hard to find 10 people willing to contribute. You can even count the people talking or organizers.
Here's one for example: https://twei7.com/papers/Sur_Wei_MobiSys14_Dia.pdf
Destroy all software is closer, but is kind of like one guy. Great for him! And for me on my flight here in a few minutes. But what I envision is more like training speakers to be concise and engaging yet informative. Kinda like how an editor helps a writer cut out things to make a better novel, but for tech talks. A tall order, I know.