The listed shortcomings all sound like features that over time should be developed by Twitter. Assuming those features are value adding.

This reminds me when Google Analytics stormed onto the market. Many analytic companies expired. Those that evolved had to aggressively compete and label them self at enterprise level with more features and integrations. However in web analytics space Google did not own those websites being monitored so there was opportunity left for the client analytic companies.

Competing with Twitter analytics is like a company trying to build a business around Facebook Insights and trying to compete with them. Might work in the short term but long term the odds of survival are low.