Yes, PCs aren't ageing as fast as they used to.
But they are obsolete beyond 'not being portable'.
Here is why tablets are winning:
1. Instant on. I can keep my thoughts in tact and act on them immediately. No booting, no memory lags, no millions of tabs open in a browser.
2. Focus. Desktop interfaces seem to be desperate to put everything onto one screen. I have a PC and a Mac (both laptops). I prefer the PC to the Mac; better memory management for photoshop and browsing, and I love Snap. But that's where the usefulness stops. With an ipad, I have no distractions on the screen.
3. Bigger isn't better. That includes screens. Steve Jobs was wrong. The iPad Mini is better than the bigger variants. Hands down. Same goes for desktop screens. I want a big TV, because I'm watching with loads of people. I don't need a big screen for a PC because the resolution isn't better than an ipad and I'm using it solo. Google Glass could quite possibly be the next advancement in this theme.
4. Build quality. PCs look and feel cheap. Including my beloved Sony Vaio Z. The ipad in my hand could never be criticised for build quality.
5. Price. The ipad doesn't do more than 10% of what I need to do. But, I do those 10% of things 90% of the time. So why pay more for a PC when the ipad has no performance issues and takes care of me 90% of the time.
I used to think shoehorning a full desktop OS into a tablet is what I wanted. Seeing Surface, I can happily say I was wrong. I don't want to do the 90% of things I do 10% of the time. That's inefficient and frankly boring. PCs and Macs are boring. Tablets are fun. There's one last point why tablets are winning:
6. Always connected. It strikes me as absurd seeing laptops on the trains with dongles sticking out. It takes ages for those dongles to boot up. I used to spend 5-10 minutes of a train journey waiting for the laptop to be ready. My ipad mini with LTE is ever ready. And cheaper. And built better. And more fun.
The PC isn't dead, but it will have next to no investment going forward, so will suffer a mediocre retirement in homes and offices across the world.
Note: I love my PC. I just love my ipad mini more.