I definitely don't think we are anywhere close to the "post pc era" however I don't see a need for laptops anymore. If I want a portable device I use my phone or tablet. If I want a fully functional computing experience I use my self-built desktop. Who wants a laptop anymore?
At work I love my ThinkPad T430. It's plenty fast and small enough to be portable. Outside of work though I would never give up my desktop. My personal laptop is an ancient 12 year old Vaio that I barely use because I have very little need to be portable at home. When I'm on the go I just use my phone albeit rarely. I have no need for a tablet and would rather spend the money on upgrading my desktop.
When it comes to business and everyday use, sure I see the tablet and other mobile tech taking off; however, for us gamers, we need our desktop PCs. I don't see Tablets filling that void that we need for high-end gaming PC. There's only so much you can put into a Tablet before it becomes huge hassle to use portably. If anything, we these huge HDDs (8TB) and Nvidia vs AMD for the best consumer graphics cards, I think Desktop PC has a huge future in front of it.
I see your point, but as a programmer, I need a laptop. Being able to do all of my development on a single machine is too convenient. That being said, a tablet would never really be able to fill the need of running my development environment. For gaming, I do use my custom built computer, so I do see eye to eye on that point.
There is most definitely still a market for laptops. I just don't think dell realizes that said market isn't as big as it used to be. I don't think there's demand for 30 million dell laptops.
I want to buy a DEll Notebook. Total cost including shipping cost should need.