I have yet to meet, in my entire life, someone who got into hockey later in life. The only people who can bear to watch it on tv are people who grew up playing it or at least lived in northern towns where it was a big deal.
IMHO, they must change two things to get people to watch it on tv. First, they must make the puck more visible on television. That might be done graphically, like they did when they showed the streak a couple of years back. The other thing they have to do is make the net bigger so that there is more scoring. I'd say widen it by at least 18 inches on either side and make it taller by about a foot.