All it takes is one killer app.
I think you're under estimating their partnership with Disney. They have an obscene amount of entertainment IP and millions of people willing to spend thousands on experiences on their own. Add in Apple's expansion into sports and ESPN's massive amount of sports coverage and that's another big potential audience. They're making a push into 3D capture, which is very different than just putting a TV in a wall.
I think you're underestimating the appeal of floating iPad apps, too, though. Hearing it won't sell systems, but demoing it will. This is the device the entire market has been waiting for. Everything else has serious compromises that the Vision pro doesn't. The resolution and passthrough latency are game changers.