Deciding what to do with Mantha has a lot to do with where we expect this team to be in three years, imo. If we think Yzerman is going to somehow turn this club into a cup contender in three years, you hang onto Mantha. If not, you deal him. Even if he ages well, and is productive as a 30/31/32 year old, he's not going to be the same Mantha we see today. He is going to slow down. That's just the reality of life. Shanny was 28/29 when the Wings were winning their first cups with him, the guy was a physical force. He left a mark on the game. When the Wings won the Cup in 02, he just wasn't the same guy. still productive, still that big shot, but he just wasn't the same player.
Mantha could be a helluva player, especially if he stays healthy. But if we are talking about returning to contention in 5+ years, the guy just isn't going to be the sort of player we will really need. Now, whoever we get for him might not be worth much, either. might bust entirely. But we're going to want a guy who is just flat out younger than Mantha at that point, hitting their peak at the right moment, to be one of the real horses this team can tie itself to.