Allow to serve 10Ks-100Ks of users subscribed for a HideReplies app
Allow a free-plan developer to serve 10Ks-100Ks of users subscribed for a "hide replies" allowing to hide tweets nearly real-time as they happen (provided that an app is capable to deal with such a firehose).
This at least requires easy access to a stream of direct and indirect replies to the users subscribed.
Thanks for your suggestions! We are currently considering higher rate limits. Additionally, you can already access a stream of (in)direct replies to a subscribed user with the Account Activity API.