I bolded those two lines because you don’t even know what the return would be. You’re just assuming it’s a 1st and good prospect. It’s highly unknown if any team would pay that right now.
And if they would do it now, why wouldn’t they do it at next year’s trade deadline? Or in June for that matter? Schenn’s contract would then have one less year on it which could be MORE appealing to some teams, and if it’s in the offseason then it makes it easier for teams up against the cap. He’s on pace for 50 points right now. I don’t see his game just dropping off a cliff within the next 12 months, he will still be an adequate middle 6 player so yes, I’ll see it again: his value won’t change much.
Regarding your last paragraph, that’s still highly debatable. Let’s say we get a 1st and a prospect. Let’s say that is a late 1st and Fraser Minten from Toronto, as has been discussed on the trade board. We don’t know if Minten will be a good NHL player, and I’ll bet that he probably never becomes better than what Schenn is right now as a 33 year old. And we certainly don’t know if a late 1st in a weak draft will ever be an NHL player either. If the Blues make a trade like that, I’ll be fine with it, but to me that’s not a “can’t miss” package that we wouldn’t be able to get in the offseason, or at next year’s trade deadline. We would be fine without those pieces, they aren’t really moving the needle right now. That’s why I don’t understand the rush. If Armstrong gets a can’t miss offer then I’m sure he’ll pull the trigger. But I kinda don’t think it’s going to happen.
And lastly I think you’re just underrating what Schenn brings in general. He’s absolutely still a good 3C so we would need two middle 6 centers this offseason if we moved him, and we’d also need a new captain. Many players have raved about his leadership and what he brings to the team, he can play up and down the lineup, is one of our most physical guys, etc. But hey, who cares about all that when we might be able to acquire a draft pick and middling prospect. Yippee.