Little boys will attack anything that can't hit back, lol. I have a set of inflatable toys that I use for toddler classes. I only bring them now when I have a private lesson or the the tot class is girls-only because invariably, the little boys would kick/step on/try to pull apart/otherwise my toys. They were my oldest DD's and I've had them for years and year, so I'm a little too attached to them.
I'm not sure an inflatable wall would hold back the little hellions, lol. They'd try to figure out how to jump it or put their blade through the side.
In a dark corner of our rink, there are some foam-filled bumpers like the concrete "jersey walls" you see on highways. They've never been used AFAIK and honestly, I think they're a breeding ground for mold.
I'd love to use them to block off a tot /beginner area for a family skating session but those skaters usually need the wall to get around. I don't think the bumpers would give them enough support.