I don't see it personally. Everyone keeps saying his body will breakdown etc. Sure if he played like in his first season with the Avs when he was Viking, but ever since then I feel like he has played fairly soft game. I don't see power forward there. He does it now and then but I wouldt worry about his longevity.
He works hard but he is not making huge hits and fighting every match. He plays fairly soft imo.
I think Landy realized after first season in NHL that he can't continue like that for twenty years, so he changed his style. He is fairly conservative today.
Landy consistently goes to the tough areas of the ice. He often parks himself in front of the net and takes all the physical abuse that comes with this. He also plays a ton of minutes against top competition and yes does sometimes goes full viking mode. If you look around the league, guys who play like that often end up becoming significantly worse players as they age. In Landy's case, what happens if he gets a nagging or serious injury that affects his speed? Landy a step slower is no longer a top line winger. His current play style, as you pointed out, is a much softer game than before, but it's because he's started relying more on his speed and his hands.
Look, I'm not saying it's guaranteed that he declines any time soon, but based on comparable players around the league, I think the risks are higher on a long-term contract with him than with a player who plays a different style. Any time you sign a player to a long-term contract you're taking a big risk anyway.
Heck, even if he was a totally soft player, I'd still be wary of signing
any 29 year old to a long-term deal. It's my opinion that every season after age 29 is a roll of the dice as to whether you see a decline in play. Look no further than the free agent class of 2016 to see some prime examples.