5x5 is a good basis for comparison b/c PP scoring often is a matter of being on the right team with a couple really good playmakers setting you up. If Michkov is for real, and Drysdale can fill the PP QB role, everyone else should double their PP scoring this season without being better players.
The other thing to remember is PP/PK are essentially mirror images, if you can build a top ten PK unit you can get by with an average PP (which should be the Flyers' goal right now). A top PK depends on solid goalie play to be effective because even a bad PP will still get a shot or two on goal every PP.
If you can't find a McDavid, you can build a solid offense around three lines (see Dallas). So an extra guy over 40 will balance not having a guy hit 60+.
Top scoring teams, players over 40, players over 30:
COL (304): 4/7 (Makar, Toews) - 5 forwards over 30
TOR (303): 5/8 (Reilly) - 7
Dallas (298): 7/10 (Heiskenan) - 9
EDM (294): 5/8 (Bouchard, Ekholm) - 6
TB (291): 5/7 (Hedman) - 6
NJ (283): 3/6 (Hughes) - 5
NYR (282): 4/6 (Fox) - 5
Van (279): 5/8 (Hughes, Hronek) - 6
CAR (279: 3/8 (Skjei, Slavin) - 6
FLA (268): 4/5 (Forsling) - 4
Bos (267), Winnipeg (259) - you don't need to score if you have top goalies!
Flyers (235): 3/5 (Sanheim) - 4
Couts 29, Laughton 26, Foerster 24, York 22, Atkinson 22, Brink 20, Cates 16.
Out of this group, you need 2-3 to jump into the 30+ group, and Frost from 30 to 40+.
MIchkov replacing Atkinson is a good bet for 1.