every NHL player trains extremely hard in the offseason and follow ridiculously hard routines. Players have to be at a certain level nowdays to play in the NHL. The dmen are no longer huge and cant skate like they used to. These kids are giants and can skate like the wind and its tough for forwards to score. And goalies are giants and take up the whole net. They can make new rules all they want but I really never see scoring going up significantly ever. Nowadays if a player has limited skill, they are taught by certain types of coaches to play a shutdown role or an aggressive role etc. Back in the day when a 3rd and 4th line came out, they were goons and looking to fight where as now, there are almost no fighters in the league and its a hard skating battle with limited hitting and skilled guys doing their thing but getting shut down by different traps. The only way scoring gets higher is if they come up with ridiculously horrible ideas to gve players more penalties and then that will create more PP's. Scoring is on the decline yearly and I don't see it ending.
The best way for them to increase scoring is to ban all offseason training for a few months so then when training camp comes around, we see who all the natural goal scorers are and let them do their thing hahah