Lots of interesting trade proposals. For Marner, the one that I could see happening would be with Arizona/Utah. Smith will be wanting to make this team both exciting and a playoff contender. Marner fits the bill there., and we get two good players (I'm talking out of the side of my mouth here because I do not know these players' stats) to help balance out the lines. Also, we get out from under Marner's next contract demands as well as his disappearing acts in the playoffs.
I can't see Tampa doing it because those two players are signed for quite a few years at very reasonable contracts. As for the Kings, they already have PLD for the next 8 years (yikes), so I cannot imagine they would want Marner and what his next contract will be. I am not familiar with either the team or players with the other one.
I think if Rielly is willing to go anywhere, it would be either Vancouver or Seattle.
I think Tavares wants to stay, and I don't blame him if he does. It's his right to do so.