Doubtful on the playoff idea, l would think. It's a pretty expensive proposition to pull off. And inconsistent spring weather would make things a bigger challenge.
NBC subsidizes the event to give them an alternative to college football and NBA hoops, which they have no rights to broadcast on New Years Day.
The NHL likes the special promotion of the league which accompanies. CFL stadiums don't have January games to be disrupted.
The NYD niche that they've carved out has nice value for all involved. One might imagine maybe as many as a half dozen regular season games. But diminishing the special circumstances of the niche would seem to have a negative impact after a year or two.
The Stars worked for more than a year to make it happen. And since it has to be played during the day, because of lighting inadequacies, more restrictions come into play.
Although everybody involved in Dallas loved the event, it's hard to imagine too much expansion of the idea.