It's not to say that the Pens won't make some changes during the offseason but, if they do, it won't necessarily be due to salary concerns. A quick look at Capgeek shows us that the Penguins' cap situation isn't necessarily as dire as it appears like at first glance.
Of course, it all depends on what players like Dupuis sign for and if all of the players listed above want to come back.
Outside of being unable to sign Malkin and/or Letang to an extension and therefore being forced to trade a big name this offseason, the Pens line-up at the start of next season could look pretty similar to the one that started this season. And that's not a bad thing. That's a very competitive team.
The Penguins only have five players signed beyond season and $39,700,000 in cap space that year, if the salary cap stays the same. If you're looking for drastic change in the Penguins' line-up, that's where they will probably come.
The Penguins may still decide to change up the team for next year, but it will most likely be due to hockey reasons or because a player doesn't want to re-sign, not because of the cap crunch that we are all predicting. A look at the numbers shows that the Penguins can retain most of their players (outside of the deadline deals) if they want to.
That's not to say that this will be the exact Pittsburgh Penguins' line-up next season. Some players will probably be different. The point is that it's possible to dress a line-up that looks similar to this one.
It's not as bad as it seems.