I generally agree with both of you -- I just find it fascinating that the hardware manufacturers are trying to find a one-size-fits-all device. It's more beneficial for them to keep a clear delineation between phone size and tablet size. Consumers feel the need to purchase two devices instead of one.
Agreed 100%, while try to force the two products into one? I mean sure, you'd be able to do bigger screen work on a device you have with you. But the issue is when you merge smartphones and tablets, you get the worst of each, not the best.
I'm all for smartphones ranging in size from 2.X" displays for candy bar QWERTYs to 4.7" displays, which something like the Galaxy Nexus for over all size. Big display, small amounts of plastic bordering it. Anything above that is just pushing it in my mind(at least with how small screen bezels can be at this point)
Then start tablets at 7" and work your way up to 13" for those who want a large work space. I except most tablets will be 7" or 10", but the sizes in that range of 7 to 13 all make for reasonably portable machines, that keep in mind the goals of the Post-PC world(which I will miss dearly, as I never got a chance to buy a Mac with any reasonable room to expand. But hopefully the Mac Pro stays around, and I can pick one up one day.
I understand this focus on Post-PC world and I actually love it, it's make computers much for straight forward. But my fear is company that offer great PCs will start to step away from that market of PC with room for growth(which admittedly a lot a corporate users never need, but I like the freedom). Sure, I can build a PC and save money, but the lack of official OS X support along with having to hack every OS upgrade to my Mac, would mean OS X couldn't be my main OS for school and work.
The Post-PC world is good, far more of us can get away with cars(iOS, Android devices), but for those of us who need or want trailer trucks, it'd be a shame to see Apple drop the Mac Pro. If they really want to spice up Mac Pro sales, let prosumers and pros have far more control over the specs of the Mac Pro. Sure the big hardware is needed to that top of the line hardware that's inside. But pop some mid range desktop parts in that machine, cut off 1000 dollars, and I think you'll spur sales of the Mac Pro. I know for certain I would have went for the Mac Pro over the Mac mini server.