Dak doesn't have the ability to be elite. He's just not gifted that way. He has never in his life shown that he has the ability to be an elite level QB.
He wasn't highly recruited out of high school. A lot of schools (specifically LSU) wanted him to play TE, but he wanted to be a QB. He was a 3 star recruit. Nothing special.
He was a dual-threat QB in college, 4th round draft pick, nobody thought he would ever be anything, but injuries' to Romo and Moore gave him his chance. Again, it wasn't him impressing that gave him his shot, but rather circumstances.
Now he's in the NFL and still just nothing really special. He had a good rookie season and he's still trying to surpass that, but that's where we are now 6 years later and he seems to have gotten better as a pocket passer, but worse as an overall QB.
I loved 2016 Dak and would take that Dak any day over the one we have right now. I loved the way he played in 2016. There was elite talent all over that offense in 2016 though, so I don't think we can recreate that with this current team.
He can be decent if he has elite players around him though. So, the best we can hope for is the guys around him to step up and become elite.