That would definitely be useful as there are already a few efforts to deal with speech recognition (like http://rospeex.org/top/).
I would suggest you try to find other packages on the wiki or ROS answers (e.g. http://answers.ros.org/question/9156/voice-commands-speech-to-and-from-robot/) and try to see if you could come up with a common message. That would greatly help speech recognition efforts.
For pocket sphinx specifically, check with the authors of the other packages you have found and try to see if they would be ok to merge with yours (they might not be on this mailing list so pinging them right up could be nice).
And yes there is interest! Robots need to interact with humans!
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