I mean, with JJ gone for Star Wars, even if they squeeze out one more film, I see that being the end of the line for this continuity, after which they will probably think "We did fine, but there was too much collateral damage by trying to split the difference. We should just try a full reboot next time."
I think it won't happen that soon. They can just stop refering stuff from old Trek and that'll be it. Another reboot is inevitable, but I'd rather they avoid it for another 20 years.