A link here to describe the contours of the NHL
http://www.sportsnet.ca/hockey/nhl/hirsch-explains-how-to-fix-the-problem-with-
This is the difference to what the NHL wants to do to alter goalie equipment, although it is subtle, keep in mind the puck is a few inches wide.
The question to ask here is whether or not the goaltenders will be able to adapt in time to become competitive. Personally I believe these guys are professionals and will have no problem adapting to these changes. This isn't the first time the NHL has tried to change the rules to lead to more goal scoring. After the lockout goalies pad size decreased along with the trapezoid behind then net that prohibits them from playing the puck. The NHL also cracked down on penalties causing for more offensive chances. All of these changes and still the NHL continues, maybe these guy are just that good. They've adapted before and they will adapt again.