[nfnaaron]

Cooler Twitter. Enterprise Twitter. Better Personal Twitter management.

"What possibly" and "conceivably" assumes that the current form of Twitter is all it could ever be.

If they're smart enough to do Twitter, they're smart enough to enhance Twitter in a way that people will pay for it.

Keep in mind, this is all based on the linked article's characterization of Twitter as an ad company, and what they might do instead.