You might well be right; I just hope things don't go the way you expect them to, because it doesn't sound like much fun. I have been disappointed by the steady disappearance of physical keyboards from phones; my current phone has a touchscreen, and while I can get along with it, typing more than a sentence or two just sucks. It's slower and far less accurate - it is only the presence of an extremely aggressive autocorrect system that makes the touchscreen keyboard usable at all.
In a world where your average home PC is actually an iPad, I'd rarely, if ever, write a comment as long as this one, because it'd be so much irritating work.
if you take a tablet and attach a keyboard, how is that different from having a laptop?
None, but you just agreed with me.
Not so much. A computer is a computer is a computer, so all we're talking about is the form factor. "Tablet" is a form factor which works for situations where you are lounging around: sitting on the couch or the easy chair, in bed, something like that. But what are you going to do when you need to write a bunch of text? You can stick your tablet into a tablet holder, pull out a keyboard, and start working - um - wait, except you've just re-invented the laptop, badly. So now you have an awkward laptop for doing desk type things. This is in fact a very significant amount of the work people do with computers today, and I believe that we will continue to have many devices available which are designed for that type of usage.
Obviously tablets are going to grow much more quickly than PCs, because they are a form factor which is suited to a range of computing activities that previously went unserved. That means the hot development money is going to move to the tablet world, all the aggressive young startups will go work on tablet apps, etc. It's just the same cycle that we saw with phones. But that doesn't mean PCs become any less important than they are now: it just means there's a huge new market which is drawing all the new attention.