Yeah very true, I think the main reason for this is the ratio of lurkers to contributors has always been so high. So until mags start getting more subscribers things might stay that way.
Although, I've found there was no InternetIsBeautiful mag so I went ahead and made it and have started to post on it when I can, attempting to drive some traffic to it and start some discussions at the very least.
I think we'll need to be the change we want to see and just start posting and commenting as much as possible!
Things have been hit and miss for the last day or so in terms of viewing other communities on other instances. You may find that in a few hours it's showing posts when browsing from kbin, I'm seeing other ones that were empty now starting to show posts and comments.