That doesn't matter when their revenue per user is as high as it is.
They're at $5B ARR and rapidly growing.
This is already happening.
> Wait until smart glasses or watches with AI overtake cellphones
Smartphones are crystalized perfection. It's such a peak design. The size, form factor, sensors, input/output modalities, and generalization are perfect. The reason companies are trying to supplant it is that they need to get out from under Google and Apple's control. It's not that anything is wrong with the smartphone.
VR has a long way to go in terms of hardware problems.
XR/AR is ridiculous. It's creepy, unstylish, and the utility is highly questionable. Nobody is going to want to be a walking ad.
Time will tell, but to me they feel like desktops did 20 years ago. The process of enshitification has turned simple tasks complicated and everyone wants a different, privacy destroying, frustrating to use "app", each of which has a slightly different UI paradigm, a mandatory subscription I've forgotten to cancel for two years straight, and a confusing name to remember. I now have something like 90 apps installed on my iphone, and I can only remember what something like 40 of them do. My damn cat box has an app, and instead of naming it something sensible like "Shitbox 2000" they named it "Whisker".
Was it "Foober Eats that had taco bell, or Instafart, maybe it was Dine-N-Dash? Where's the back button on this thing and why is it different from every other app? Is this an ad or content, does it even matter anymore? Why do I need another login, what happened to SSO? Why won't my password vault work for this one app? Did I register for this one with my google account or apple? Who took my pills? Stay off my lawn!"
When the day comes that I can just tell my device what to do, and let it get it done I'll be very happy to dump that cognitive load onto someone/something else.