I've long been of the opinion that goalie play has too large an influence on the outcome of hockey games. One team can be substantially better than the other in overall play, by whatever measures you like, other than the actual score. But a relatively small difference between the 2 goalies can be what determines the outcome - all too often. The ever larger goalies with ever larger equipment is only making this worse.
I'm not looking at this issue from a hockey fan perspective. I'm trying to step back and look at it from the POV of someone who has never watched a hockey game. Get that person, who has never seen any of the games, to study hockey vs soccer, football, basketball and whatever other games you like and evaluate the games themselves. I think they would like hockey for its speed, skill required, etc, but conclude that the goalies influence is excessive.
Coming at it from that perspective, I think you could justify making the nets much bigger, like 2 feet wider and 6 inches higher. The argument against that would obviously be that it would change the game too much. There is value in the history and traditions. But the huge goalies with massive pads are already doing that.
That said, your modest proposal for enlarging the nets seems like a no-brainer to me.