My guess is that it will be successful over a multi-year timeline like the Apple Watch.
Done well, a mixed reality headset is just too useful a tool. Imagine adding AI to it and you have something approximating a holodeck in terms of its usefulness.
That said, I can imagine myself waiting until V2. I tend to buy Apple products early, but only when I can see how they are going to make my life better. I’ll need to see this to be convinced.