My understanding was that the plan was to have a huge relaunch to put the franchise as a whole back on the map somehow. It would seem possible that other characters will get a spotlight in the new program and it's not a give that X-23 will be one of them. (I'm sure she's popular enough that she will be in a series somewhere and will get another solo sooner or later, just not sure where her place is in the near future is all.