They have won with that core( Malkin, Letang, and Crosby) multiple times. Nothing more to lose, It's like one last ride or two going into the sunset. I think they know this is it for awhile.
But with that said, once that trio is gone, Pittsburgh will be in for some painful seasons, and with such a poor prospect pool will take them even longer since they have to recoup those assets. This is why I hate trading 1st round picks.
It's also very frustrating that they win the lottery multiple times, get players like Crosby and Malkin, win multiple cups, and here we are with F'ing Laffy Taffy. lol.