But it’s a replacement/supplement for a monitor in the same way an iPhone is a replacement for an old style cell phone. The iPad is an extremely niche solution but there are still enough niches for it to sell well.

Smartphones had many drawbacks compared to old phones too. The only huge problem with the Apple AR is the price.

my only point is that it will be a toy, or for niche applications.

Your only point is the same point people with no idea of how things work have been making since forever. “It’s just a fad”. This was claimed about cars, about the internet, about computers, about videogames… Literally anyone who’s out of touch with reality and resents their lack of creativity or ability to think of a use for a groundbreaking technology positions themselves this way. It’s not new, and maybe it’s sometimes worth debating, but not when you follow it up with something like this:

this isnt going to be a an ipad-level device.

The iPad? Really? That’s your idea of a gamechanger? If you think ipads are anything except “a toy” and “for niche applications”, you’re living your wildest years, my dude.