Great point. The API access restriction hasn't stung TapBots yet but the token caps are frustrating and potentially stifling to future growth.

I'm interested to see what Twitter will do when Tweetbot starts to approach the maximum number of tokens allowed. My guess is Twitter will grant Tapbots extra tokens. I think the API restrictions are geared towards preventing new companies from using Twitter's APIs in unintended ways (like Flattr) than shutting down established Twitter clients like Tweetbot and Echofon.