If the new series is set after Nemesis and does contradict the Novelverse in major ways, do you think CBS would allow us to say that the Novelverse is a parallel universe and continue writing stories in both continuities? Or would that be too confusing for the general public?
It's possible there could be some kind of branding to set them apart, like the
Star Wars Legends label, but as I understand it, there aren't any new
Legends stories being told. If there were major contradictions up front, we'd probably just have to drop the current continuity, at least those parts of it that were in clear conflict. At most, we might get the chance to wrap things up before starting over.
However, if the inconsistencies are more subtle, maybe we'd get to do what we did while
Enterprise was on the air, or what the
Star Wars EU did with the prequels and
The Clone Wars -- continue the existing continuity but gloss over or retcon away those bits that are contradicted.
Really, we won't know until it happens. None of our speculations should be taken too seriously.
How are Byrne's comics a separate continuity?
All the licensed tie-ins from different companies are separate continuities. IDW doesn't even have a single uniform continuity to its Prime-universe comics, instead letting its various creators interpret the universe in their own ways. John Byrne has put his own personal spin on things throughout all his IDW Trek comics.
Even if the new series is set in the Abramsverse, it still wouldn't mean the Novelverse is safe. An offhand mention of McCoy performing a caesarean on a Gorn in Star Trek Into Darkness contradicted the novel Seize The Fire which described the Gorn as an egg-laying species.
But there have been larger continuity errors than that within Prime-universe canon (for instance, the different portrayals of the Trill in "The Host" and DS9) and within the Novelverse (for instance,
The Left Hand of Destiny and
Spirit Walk portraying Boreth in contradictory ways, the former as a frozen wasteland with no indigenous life, the latter as a world with a lush jungle used as a hunting preserve). Any long-running series is going to accumulate some inconsistencies. As long as they aren't too massive or pervasive, they can be glossed over or explained away. Heck,
Seize the Fire itself undertook to reconcile "Arena" Gorn with "In a Mirror, Darkly" Gorn by positing that the species had engineered itself into different types. Who's to say they can't have a variety that gives live birth?