My thing with re-signing Murray mostly comes down to cost and what he'd bring back in a trade. If Murray is bad in the playoffs, you can likely get him on a 1 year deal and run with a Murray-Jarry tandem next year. If Murray is amazing in the playoffs, he'll probably price himself out of Pittsburgh and I'd trade him. Anywhere in the middle depends on what he's asking for.
The perfect situation is that Murray is good to great in the playoffs, is willing to sign a reasonable long-term deal ($6-$7 million AAV), the Penguins trade Jarry at the draft and Murray is a consistent .915 save% goalie going forward.