On the contrary, one could contend that the fact that few teams have won the majority of NBA championships means that it is easier to build a championship, dynasty caliber team.
NHL teams have to do the same thing as the NBA, 16 wins in two months.
The NBA playoffs do not have the intensity of the Stanley Cup playoffs. When the final scores are 2-1 instead of 94-91, and you may have to throw the dukes at any time, there really is no comparison.
I'm a fan of both the NBA and NHL, and it isn't even really that close.