The culture and style of the NHL is always changing. We've had the "Dead Puck" era in the late 1990s and 2000s after the wide open, high scoring '80s and the brawling '70s.
This article analyzes current NHL players who would have had struggles playing in past eras. That is not to say they would not eventually be successful, but that a part of their game that makes them so successful now may not have been as successful in a particular era in the past.
Feel free to disagree or to add some players that you feel would have struggled in a particular past era. As always, back up your argument with some facts, discussing these lists is always part of the fun.