Microblogging has become too important for Twitter to rule the field.
slate.com
slate.com
For whatever reason, twitter has been given lots and lots of money to provide this service. It's otherwise impossible to compete with "provide a very expensive service for free"
- every account is also a mailing list
- messages have no body, only a subject line
- all the messages flow through a single company's servers
It would be technically trivial for a major email provider (say, Google) to create a Twitter clone.
identi.ca is promising as it's federated and all that, but when you go there, you see the same thing over and over again: "How do I use this with SMS?" I don't think users understand the enormous cost twitter is just eating for no apparent reason.
And that's the main thing twitter has that is hard to reproduce: SMS in and out at scale. It's not that that's a hard technical problem, it's just incredibly expensive to do that.
For a given, plucked-from-thin-air definition of "hard", no, it's not hard.
In the real world, yes, it's hard.
I don't see why the fact that people rely on Twitter should mean that they need to be broken up or opened up or any such thing.