I feel like saying "a single inch" like it's a pittance when we're talking about airplane legroom is a bit silly. Sure, it seems small compared to the other 31 inches, but that's not a fair comparison, because most of those 31 inches are non negotiable.
Realistically, we're talking about at least a 5% reduction in leg room, and that's nothing to sneeze at.
You obviously are not above average in terms of height. I'm 6'5" and planes are a nightmare of cramps and bruised knees. A single inch can mean the difference between being able to sleep comfortably on a long flight and staying awake while stiffening up for eight hours.
This means that it will be a "Problem", but no one can say for who. The big gun manufactures are going to be pissed and are already probably already preparing legislation to bitch slap any one who tries to produce these guns. The liberator people are working on making the guns not explode and hurt anyone. The police are scrambling to figure out how to reclaim their sole ownership of force. The people are waiting to see what happens.