8. There's a lot of really fascinating stuff going on.
and I don't believe for a minute that it won't one day be possible, but I've seen (in fact I see it daily) what happens when you try to run to much stuff through a finite amount of bandwidth; this might seem like a cool idea to some people, but if all they ever do is wait (like we do at home if 3 people are streaming videos) it will get old fast.
That will, no doubt, be overcome at some point; the world isn't ready for it yet in my experience. I could be wrong, but this isn't cool enough to wait very long for.
There's cooler stuff on the horizon, but what do I know I thought twitter was lame (still do) and it seems to be going strong.