I don’t see wall-mount iPad happen. They’d have to offer it in to many different sizes (that also is the reason I never understood why people thought Apple’d start making smart TVs)
The UI also wouldn’t be as good as that of an iPad on your lap, I think, and you can already use airplay to mirror your iPad’s screen on a large screen (https://support.apple.com/en-gb/HT204289)
Finally, if you have a Mac, it can run this program, too, and thus show this on a large screen.
I'm not sure what you mean here - to be honest I'm not sure what the strategy is with something like this. Corporates typically don't have Macs (though they will have phones)
With hybrid work a thing, everyone is trying to win vertically integrated online collaboration. Eventually they’ll sell a wall mount ipad.