If everyone who was on the roster was available for the playoffs, perhaps. But with Letang's concussion issues, plus Maatta and Dupuis already being ruled out until next season, it's not like as soon as the playoffs begin the Pens can play all of them without worry of cap penalty and suddenly they're a stacked team.
Also, the way I see the Pens if I am looking at them from the eyes of opposing fans is, they're the type of team you worry about playing in a given round because if Sid and Geno go beast mode, they can knock you out. But they're not the kind of team that you put money on to win 4 rounds.
That's my mindset, anyway, when looking at this roster. It wouldn't shock me if Sid and Geno are enough to carry the team to one series win, but I have zero confidence that that can carry over 4 full series.