jeps
Arcadefire
yeah, you could even say that he brought it to the forefront of the american sports world. sure, the nhl was around long before his arrival in LA. but what it did imo was it opened up the possibility that the nhl could sustain teams in warm weather climates. this undoubtedly had a tremendous impact on the brand.
The thing to consider isn't just LA though. Sure, the LA Kings had been around for years, but so had the Golden Seals/Seals. Hockey was a small enough market to only support one team in California. However, after the advent of gretzky, hockey could now support three teams.
As well, look at the minor leagues/minor league involvement. They skyrocketed when Gretzky came to play.
Hockey Hall of Fame members from the US aren't numerous, but the places they come from say a lot - Kansas, Minnesota, Missouri, New York, Pennsylvania, Texas.
Ignoring Kansas, as the member inducted came before any franchises in Kansas, and Minnesota where there is a canadian-style hockey culture, Missouri - St Louis Eagles/Blues. New York - Ranges/Americans. Pennsylvania - Pirates/Quakers.
The Texan, Brian Leetch, started to play hockey in New England, at a prep school.
The fact is that interest in hockey in the states is not a given, and spurred by success or a big name player, which drives minor league hockey, which creates more major league success, and the cycle repeats.
Gretzky did that in the biggest extent that has ever been seen. Within a year, people already felt the changes (he tells of an anecdote, how upon his arrival he mentioned that it was weird that nobody was playing roller hockey in the summer, but within a year, tennis courts and basketball courts had signs up saying "NO ROLLER HOCKEY"). To me, that's huge.