The micro.blog universe

I’m enjoying micro.blog at moment, having spent time bothering to follow people, chat and post short updates.

The micro.blog world seems quite small, even neighbourhoodly, which is cool, but I do like the sense that your bit of, say, Twitter is a mere speck in the universe, and that there are millions of other probably quite weird worlds out there. If micro.blog expanded to Twitter-like proportions, in what ways would it change?