It's tough. As others have said, he certainly excels in certain elements of a defensive line role (he's probably one of the top 3-5 pass rushing interior linemen in the NFL right now. Without exaggeration.), but he isn't anything special in providing a clean near space for the inside linebackers. One could argue that it's worth it, generally speaking, as long as you can get a couple ILBs that have the ability to shed blocks and move through trash quickly, but we really don't have either of those, despite Bradie's emergence as a more versatile player on the inside.
But I'm not so sure about Jay at DE. The advantage he gets from his quickness and ability to make himself skinny through gaps in blocking schemes will be different at end. Yes, he'll get more single blocking assignments, but this isn't Madden, guys. On the defensive line, every position has its own quirks, and there's no guarantee that Jay would be as effective on the right or left - ask him yourself. When it was being contemplated earlier this year, he expressed great discomfort at being moved from his place of comfort in the tight confines of the NT position.
Now, that's not to say that if a skilled NT comes through training camp that it wouldn't make sense to make the transition anyway. Jay's individual performance is only so important if the team is more effective...but I think it would take a lot to justify moving him. It's just a lot easier to find 3-tech college lineman you can toss in at 34 DE than it is to find someone to replace Jay at NT.
