Kind of hard to get a grip on where the Flyers are going. A Youth movement is really the only way to go, but that puts them 3 -4 years away from being a cup contender if the young talent pans out. I don't think there is any other way to get there with the group of veterans they have now.
Next year is basically a season where you have to bring in the youngsters and let then go through their bumps. It is a waiting game until Carter Hart comes up, which could be late next year, or for sure 2019-2020.
I'm all for another wave of rookies next year. Frost, Rubtsov, Myers and Morin should all make the team and Sandheim and Lindblom should become full tme players. Frost will likely have to come off the center position and play wing.
Filppula is gone, so are Manning and Read. MacDonald's contract is an albatross, they need send him down to the AHL again where he won't count against the cap. Maybe someone will claim him, but I doubt it. Neuvirth and Elliot are under contract next year. No sense going after a goalie with Hart coming soon.
If you go next year with a roster of Giroux, Voracek, Couturier, Simmonds, Patrick, Konecny, Lindblom, Frost, Rubtsov, Weal, Raffl, Lehtera as your forwards and Provorov, Gostisbehere, Sanheim, Hagg, Myers, Morin with Gudas as your 7th D, then the Flyers would be around 19 Mil under the salary cap.
I don't think they should go out and sign a big number free agent, the class is not that great this offseason. They will likely have 2 first round picks (theirs and the Blues), but they lost a 3rd round pick for the Mrazek trade. They don't have anymore buyout/dead money on the books. If they could trade for stud blue liner, that would be the most effective use of the cap space.