The purpose of this thread is to warn of what may happen if more restrictions on signatures are imposed, not simply to rejoice in looking at a still photo of what this forum looks like today.
I doubt that theymos is not aware of the fact that bitcointalk owes vast majority of its current traffic to signature campaigns so I don't thnk that he will easily impose any further signature campaign restrictions. Mixer ban coulnd't be an easy one either and imho it was obvious that it was just a matter of time.
I don't think so. That would only leave a few "social media" ruled by multinationals. I don't ever visit those, and I'm not alone in that.
Forums won't completely disappear, but I would be very surprised if they remain relevant in 10 years considering how things are developing. I've been very active on various forums since the early 2000s and situation is constantly getting worse. Golden age of forums was ~15 years ago and since then its all downhill.