Hawking speaks English, not ASL. Which is basically the status quo. I was referring to the terrible broken English that a project like these gloves would produce.I have never assumed that Steven Hawking is a complete idiot because he uses a machine to talk. Neither have I assumed that for others (like the little girl in the video I linked above), and people who assume that are probably not worth associating with in the first place.
I suppose it ultimately comes down to how good you expect the translation to be. I expect them to remain at "Do not want" levels of terrible for the forseeable future, but you're obviously more optimistic.
Still, it is hard to see gloves ever replacing, say, a tablet, because they're a bulky extra device you have to carry around whereas people are more likely to carry around a tablet anyway. Also, they're only good for one way communication, unlike a tablet.