Twitter Allows Ads From Others -- For How Long?

As GigaOm's PaidContent reports:

The Associated Press is running sponsored tweets as part of a deal with Samsung during the Consumer Electronics Show. While this is allowed under Twitter’s rules, it also clearly threatens the network’s future as an advertising medium. How long will it allow this to continue?
I have sold ads into a media property's Twitter stream, and have wondered when the day could come when Twitter taps us on the shoulder. My hope is that they're smart enough to make it a win-win, so that we can continue to place the ads, and Twitter takes a small proportion, rather than shutting it down and forcing the client to go to them. That would not only hurt us , but also potentially our client (whose needs we understand) and Twitter (which might just lose the potential revenue, as well as fostering the development of "conversational advertising").