Upset is probably not the right word, disappointed would probably be a better word for how I'd feel if Landeskog and Duchene remain with the team through the deadline.
They've had to endure months of hearing their name as a trade candidate, with basically every expert saying it's a done deal that they are gone. If they don't get traded by the deadline they'll continue to hear every expert say they'll be gone during summer. At a certain point, I feel bad for the player. You shouldn't have to hear constant speculation that you'll be relocating.
Them remaining with the team isn't a good thing for everyone else either, it's a distraction for everyone on the team. It's hard to focus on the goal of playing competent hockey when you have no idea who is going to be here and who isn't.
This team needs to figure out a direction so players like MacK, Rantanen, Zadorov etc. can start focusing on the future and growing towards getting better, not worrying about who is and who isn't going to be around to help them.
So I guess my word would be disappointment, I'd be disappointed that we'll be wasting another 5+months of player development due to the uncertainty of the team, because we have no vision on how we are going to move forward to get better.