This isn't so much a rule change but rather a format modification:
I think each division should have a 3rd place match under the new format. Simply a match between the two losers of semifinals round. This is pretty traditional in single elimination brackets, to determine the 3rd podium spot. Currently only 1st vs 2nd are determined in the playoffs, while 3rd place vs 4th place is determined by regular season record. Personally I find this rather inconsistent, especially considering 3rd place is traditionally a podium finish.
Edit: another problem with the current way which determines 3rd vs 4th is that the two conferences are often unbalanced, which makes determining 3rd place based off regular season record possibly unfair/unbalanced.
The top division will have this next season. The semi finals losers in other divisions outside D1 play teams from the division above so the third place match doesn't make sense for anything below D1.