Okay, let's be systematic about this. How many cases can we list for franchises whose book license has switched hands, and where authors from the first publisher have also worked for the second?
- Star Trek: Marshak & Culbreath wrote for both Bantam and Pocket (plus David Gerrold as a borderline case). Alan Dean Foster wrote for Ballantine and did a novelization (and a cancelled original novel) for Pocket, though that was at the request of the filmmakers.
- Star Wars: According to JD, "a lot of authors" moved from Spectra to Del Rey.
- Doctor Who: Multiple authors including Paul Cornell, Terrance Dicks, John Peel, Craig Hinton, and others have written for both Virgin and BBC Books, and have even been able to carry continuity elements forward from one publisher to the other.
- Babylon 5: Jeanne Cavelos wrote for both Dell and Del Rey, and again was able to carry continuity threads across (though with the approval/guidance of the series creator).
- Marvel Comics: Peter David has written novels for both Byron Preiss and Pocket Star; Keith R. A. DeCandido edited the Byron Preiss Marvel novels and wrote one of the Pocket Star novels.
(I'm not counting the
V license's switch from Pinnacle to Tor, because the
V novels from Tor were written under Pinnacle's contract; Tor published them after Pinnacle went under.)
I'm trying to think of cases where a novel license has changed hands and no writers have carried over. The one thing that occurs to me is
Stargate SG-1; Ashley McConnell did several SG-1 novels for Roc, but hasn't done any of the Fandemonium novels. But then, that's a case where the earlier tie-ins weren't very successful or well-received. There's also the case of the
Battlestar Galactica novelizations and original novels from Berkeley in the '70s-'80s versus the Richard Hatch relaunch from Byron Preiss in the '90s-'00s, with no authors in common; but that's a much bigger gap between licenses than usual, so it's hardly a typical case.
Of course, this is strictly hypothetical. I'm in no way suggesting that there's any validity to the rumors about Pocket losing the novel license. Like I said, I think some people heard about the calendar license changing hands and jumped to conclusions about the novels.
But if, hypothetically, the license ever did change hands at some future time, there's a lot more precedent for authors carrying over than for the alternative.