I find this "Lucic will decline because of his playstyle" to be a bit foolish. The guy is probably the most physically fit player on the team..takes care of his body very well. Jerome Iginla didn't decline until he was about 37..even then he scored 29 goals and played just as reckless as Lucic with a smaller frame.
I don't expect him to be a 30 goal scorer until hes 37 though..but I can see him being a fairly productive player until his mid-30's playing along side McDavid.
Yep, there have been a lot of power forwards who had long, effective careers. Iginla, Keith Tkachuk, Brendan Shanahan, John Leclair, Clark Gillies, Mark Messier.
People remember Lindros, Neely and Wendel Clark and cry "oh, power forwards bodies break down". Neglecting to remember that Lindros' injury wasn't because he was a power forward, and Neely's was accelerated by an open ice knee on knee, something any player can take.
The only power forward that I can think of who you can honestly say had his body break down on him in his prime due to playing the physical "power forward" playing style was Wendel Clark.
Even currently you can look at older power forwards currently in the NHL whose bodies aren't really breaking down - Perry, Hartnell, Doan, Getzlaf.