Of course, the average user posts on facebook, steals music and looks a porn, all of which can be done on a high end tablet.
None of which has anything to do with running a business. I can almost understand the ignorance in the first part of those comments, but the rest of it is fear mongering, nothing more (As I type this, CNN is discussing how cell phones cause CANCER! And are carcinogenic! OMG RUN!!!!) Anyway..
I can't imagine business environments where everyone works from a phone or tablet, or any device like that. We're going to see a spike in slim PC form factors first, after that I'm not sure.
I can't imagine editing movies on a tablet/weak small form factor device, imagine how long it could take to edit, say a 3D movie, or even a standard high def movie. Using a 6core 4ghz Cpu as it is, it takes forever, a Gpu helps that along two fold, and this, will "not" be coming to a tablet near you.
So, if they're predicting the death of the PC, ....again, they're predicting the death of PC Gaming, Editing (think youtube), the end of productive business in the western world, audio editing/production, this go's on, and on, and on...
These people have an incredibly limited frame of reference, and it makes me wonder what these people actually do with their time, besides gloating on facebook about their LIKES.