He's at 6 points in 7 games, if he finishes this season at a point per game he'll have done that for about 120 games. He's not getting less than 6 million, and I don't think the Oilers can afford to lose him. McDavid and Draisaitl obviously have a huge impact on production, but you can't just throw garbage on that line and expect to get results like Nuge is getting. If he keeps it up (big if I know), I'm not sure you can be confident that plugging Hall into the same spot is an improvement, and you'll be paying more for that type of player.
You could say "well I'll take that money and buy two 50 point players", but you better pick the right ones because there's no guarantee those players are going to get the kind of bump Nuge has playing on the wing with McDrai. Especially with McDavid, it's not like he's the easiest player to play with.
If anything they'll get a discount on Nuge because they can look at his stats pre-McDavid and bring the number down. But anything up to 7 is a bargain for a guy that gets you 80 points a year, which is where Nuge is trending at right now. Again, we have to see how the year plays out though.