It currently looks a bit bulky to fit in my substitute teacher bag, but I'm sure with new revisions they will get it down to the size of a laser pen...eventually.
But they'll have to do something about the name. Can't bring something with the word "gun" to school although "glue gun" is still acceptable. I don't think this thing would get the same pass. It will have to pass the: "Will it get the S.W.A.T. team upset if you point it at them" test.
I'm sure with time and improvements, every teacher will be provided one as standard classroom issue.