Twitter's real problem is that it does not have, and never will have, a CEO with the authority to make big changes. No matter what the next CEO's vision is, as a non-founder it will be impossible for that person to satisfy all of the major stakeholders.
"Satisfy" was the wrong word but I couldn't think of the right one. What I'm saying is that the CEO of Twitter will never have the same power as say Mark Zuckerberg does.