It should limp along, but failing altogether would be bad. You could think of Twitter as a honeypot keeping the Eternal September and the spam and the bots etc

It should limp along, but failing altogether would be bad. You could think of Twitter as a honeypot keeping the Eternal September and the spam and the bots etc. out of the newer sites that are building their own respective identities and enjoying the higher quality of community that you get with a controlled size.