Not sure that it should even be a debate. Romo starts when he is healthy and has practiced some. Whether that's after the bye week or the week after that. Dak has gained some valuable experience and will get a bit of a trial by fire here these next couple of weeks. Romo has given his all for this team and deserves his starting job back, if he holds up - great, Dak then gets even more experience by sitting and learning even more. If Romo gets injured again (Heaven forbid) we now have confidence in Dak to come in and play well.
I thought Dak would be a quality backup, but nothing more, after a year or two to sit and learn. I'm happy to say it looks like I was wrong - but, he will be that much better for it if he can sit behind Romo for awhile, learn to read defenses better etc. Think Romo's salary next year is cost prohibitive to moving him or retiring - cap hit. So Dak has plenty of time, but it does look like we have lucked into Romo's eventual replacement.