Not commenting specifically on the offer in the OP, but the general notion for contending teams not willing to trade a late 1st and some prospect(s) and/or young player(s) for a 99 points versatile forward on a great cap hit seems odd to me. Does teams think they all have 5+ years cup window?
What you say makes sense and while many would agree with this as a FAN, we also recognize the principles of how our team operates /have operated as a basis for forming an opinion.
For example:
1) If the Canes thought the way you are suggesting, then I doubt they let Dougie Hamilton go. Or let Trocheck go, or even Nino. etc...
2) The Canes have treated draft picks like gold under the current administration. They rarely trade one and more often than not, acquire one or a prospect. They have picked 40 players in the 4 drafts since this org. took over. My view is they have targeted high risk/high potential guys that may or may not ever make the NHL, but if they do, should be top 6 F/top 4D. So more darts to throw at the board is key to that approach working.
3) They have traded 2 first round picks in that stretch. One of them, a late 1st was traded for a young player (25 years old) with 4 years left on his deal (Skjei), they were under the gun as they lost Pesce and Hamilton to injury, AND they had a 2nd 1st round pick that year (Toronto's); so they still got Seth Jarvis in the 1st round. The 2nd one was for Kotkaniemi who they were getting a young player that they would have control over for many years.
4) Since this new administration took over, they have traded for 2 rentals and both of them cost almost nothing.
5) They often go after more distressed assets for cheap hoping for a rebound. Trocheck, Nino, DeAngelo, etc.. So far that has worked out fairly well for them. They have not gone after a high profile, high cost (asset wise) guy unless he is younger or has term.
We recognize that it can certainly still happen that they trade prime assets for an older guy with 1 year left on his deal, but it would go against the grain for how the team has operated. So while what you say makes sense, until the Canes mgmt changes their approach to roster construction, many of us will be skeptical that a deal like this would occur.
Many Canes fans also feel that the administration isn't looking to have a short window, but want to manage the team in a way where they have a longer window and are competitive every single year. I'm not sold on that. I guess we'll see in 2-3 years when the team has to re-sign a bunch of the team.