With the API 1.1 caps on total number of users for an application, please give us an endpoint where the application can do housekeeping and remove itself from Twitter accounts that don’t actively use the application any longer.
It will be quite unfair to count into the 100,000 limit Twitter accounts that don’t use the application any longer. For example, someone authorized the application, checked it out for a day, decided it’s not what they needed, but never removed the application from their Twitter account. That inactive user is going to forever count as one of the 100,000 until you provide the application with the means to remove itself from Twitter accounts.
Alternatively, put time limits on access tokens, with an easy and automated way to refresh an access token, the way Google is doing. That way the expiry of access tokens will do the housekeeping task of cleaning out inactive users.