It's a big jump but it can be done. Murray has the tools at his disposal. He needs to find a few impact free agents and/or guys who are available because other teams have cap issues. He got done what he wanted to next year but now the excuses aren't going to be accepted.
The recipe is pretty easy:
1. If Babcock or McClellan are available, get one of them.
2. If there are guys available like Boychuck and Leddy were this year, be in the mix.
3. Sign an impact free agent or two.
4. Develop what you've already got.
5. Find a goalie (maybe find two?)
I have zero doubt this team could be 35-40 points better without much difficulty. McEichel, Reihardt, Pysyk, and Evander Kane will all contribute more next year than whoever they replace. A guy like Ennis will be sick with more talent around him.