Oh it's definitely niche, but it's not so much that people won't buy into it, it's that most of those who have a negative opinion have no use for it. How about journalists? People out in the coast/middle of the ocean? Videographers in the rainforest/Africa? People working underground?
Yes. It's a huge deal in the long run. If you can have one party over here doing something, while having communication with another party doing something else, it will make everything faster, and cheaper.
Most people investing into it at the moment are probably conferences and festivals goers who deal with a lot of weak signals. That's what they're advertising it for at the moment anyway. And I get it, I went to festivals with my school, and it's no fun when you're stuck with a group because you're afraid of getting lost within a couple of buildings and not having contact with people. Everyone has different tastes, and everyone wants their own experiences from these events, so this gives people a little freedom.
I hope they eventually rent them at conferences, festivals, hotels, casinos, and the like. I never have signal at the casino, so I'd definitely be open to that. You only have so much energy after 12AM to look for someone in a big place like that.