We increased the rate limits for a range of the API endpoints in the fall last year, in fact. The updates we announced today should also offer more and better data to developers as they scale.
Frankly, it should be a lot more about client apps and new ways to use the information in a personal manner instead of creating an API that looks for all the world like something I can use to automate my support staff on twitter and fire a bunch of people.
Twitter is so afraid of losing their users that it's becoming a self-fulfilling prophecy.