Are you saying that signing Nik to a 6+ year extended contract at $7.5 is the right move for the Winnipeg Jets? Opinions will vary of course, but mine is that it would be a mistake.
You are entitled to that opinion especially if, as you say, he is one of your favourite players.
I have also consistently been a fan, through all his ups and downs. Here is the argument for re-signing him.
1) He shows no signs of slowing down now that he is recovered from his sports hernia. One would not expect that to impair him in the future, nor would any of his other previous injuries. That is in contrast to other players who have chronic relapsing knee or back injuries.
2) His possession and production (per 60) metrics are stellar and he is an excellent complement to Scheifele and Connor, who are defensively weak.
3) Size is not correlated well to longevity. A player like Buff is much more likely to fall off a cliff due to size than an Ehlers
4)To me, he is just reaching his prime and his first line minutes reflect that.
The big con is his age. He will be in his late 20 s when he is eligible for an extension, so the same concerns that I/we had with Scheifele and Helle apply to Ehlers (although he will be younger than they were).
In the end, since the Jets appear to be going all-in on this core, there is a strong argument to retain him. As Bogo said above, there is a very small likelihood that any of our prospects in the minors tops out as a top-3 F with his unique skill set.
The big question is AAV and length of contract. I would support 7.5 with the cap going up, IF he continues in this role, with these minutes and stays healthy.