I'm sure the pads and tablets are a fine source for revenue for developers, but so are PCs, not surprisingly - but that means that we're not in a "post-PC" world, we're in a world of tablets and PCs. Which is why the claim of "post-PC" is premature at best, though many futurists would like to claim otherwise.
I am saying, again, that Post PC does not mean that PC is dead, it means that PC is not the single most important thing for software industry anymore.
Point being, it's a pointless effort to claim that we live now in a "post-PC" world, for we do not.
Yes we do, in my definition, we do not in yours. But my definition is what the industry understands from the term. Not yours. You'd have to be an idiot to claim that PC is literally dead in 2011.
As for users spending time with their tablets, well that's why I asked whether you were perhaps thinking of "post-TV" era rather than the "post-PC" era, since until now the device most used and ubiquitous has been the TV, not the PC. The question seems to be; what device do people prefer to use to waste their time with?
TV's are not computers so they really don't concern the folk in Silicon Valley, nor here, directly at least. But that's a different discussion, and to be honest I have no idea if the tablet is going to replace the TV as well. I don't see it happening soon, due to bandwidth restrictions of ISP's.
There's a lot of money in diversion, I'm not putting that down - but tablets aren't replacing PCs, they are complementing them - if anything tablets and other iDevices are replacing TV/radio and cell-phones.
They are replacing PC's. Last week my mother asked me to get a new computer for her, I asked her what do you do on your iMac, she said that she's using facebook and checking email and browsing web. Then I said that we'll get you an iPad since you aren't using anything on your iMac that can't be done on a tablet.
This is the crucial point people like you seem to miss. I have used PC's (macs I mean) all my life, and I have done tons of productive work with them. But when I look around, even my close proximity, my friends are simply checking email and browsing the web, on their PC's. And absolutely nothing else except some gaming. Gaming has shifted to consoles lately, and the rest can be done on tablets.
So for a big majority of PC users, tablets are literally going to replace their PC's. For us, tablets are never going to replace PC's. Or at least not in the next 15 years.