There are more than seven. Peter Pan/Power Records produced eleven different "Star Trek Story Records" adventures, seven based on TOS and four based on TMP (and six of the eleven were released in comics form alongside the records). And Simon & Schuster published three original Captain Sulu Adventures in 1994-5, as well as the two Spock vs. Q audiobooks produced by Alien Voices. That makes sixteen in all.
Thank you for pointing this out

Bad Robot probably would, but I don't think CBS would. If anything, it might be considered preferable to keep the audios in the original continuity so there was no conflict with the Abramsverse -- much like the Big Finish Doctor Who audios only have the license to classic Doctors.
This is true, of course a couple of the TOS actors are no longer alive, and the others are quite a bit older now and their voices have probably changed, but it could be easily done from TNG onwards. That is, if the actors are willing to do it.