Entirely possible. I dunno how Taylor and DC are gonna spin things. I could see Taylor writing a Titans book, but I can see him handing it off to someone else too. Push come to shove I'd rather see him hand it off. I've enjoyed his Nightwing and I think he'd probably write the competent, professional heroes I demand in a NTT reunion, but I worry he'd lean too hard on the "friendship is magic!" crap where everyone's just so gods damned happy to see each other, all the time, and we've been friends since we were kids and isn't that special and we all love each other so f--king much we're all gonna die! Devon Grayson was infamous for that, I think, and others have done the same and it's just so over the top and takes all the nuance out of these people and all their history. Really sucks the entire reunion dry, IMO.
But you gotta admit the timing might be perfect for Taylor to write the spin-off. Set the reunion up in Nightwing for an arc or so, then launch the series when Jon's mini ends and opens up the room in Taylor's schedule.