Would that be a bad thing? i assume that the point of twitter music is that somebody you follow shares a song, and twitter music lets you listen to that song no matter which service it is on. If twitter wants to pay for licenses so i can listen to the music my friends are sharing, what do i care if they drop support for RDIO?
Using the analogy of the current state of Twitter clients, I'd suggest that the possibility of Twitter taking away the option to easily use/link-to services that offer a better user experience is plausible, saying that they no longer add "unique value" to the Twitter platform.
edit: The warning signal should probably be louder for the partner providers though.
