I've felt this way since I built my last desktop in 2008. I was sort-of waiting for the "gee its time to upgrade" mark to roll around in 3 or 4 years, but it hasn't happened yet. Any games I want to play it still runs very well, and it still feels very fast to me even compared to modern off-the-shelf systems. When my friends ask for laptop-buying advice I tell them if they like the keyboard and screen, then its just…
We would be better off steering into the skid. History has plenty of examples of people who've tried to hang onto the old ways 'because that's how I learned it'. The way forward isn't to try and keep cheap PCs viable for creativity's sake, but to ensure that creative desires are being met on the newer devices. Would I have learned memory management and dual booting if I'd had a tablet instead of a 386? Probably not.…
But if that is your final point, I very much disagree. Besides the fact that a computer keyboard and mouse are often vastly superior to the cramped peripherals you typically see connected to a tablet, large screens and user interfaces designed for large screens often have a huge ergonomic and productivity advantage over the tiny, touch centric interfaces for tablets.
Note: the previous paragraph only applies to the current state of apps for creative and engineering activities. It could be that five years from now, tablets and their software for creating content have evolved to a point where they rival or surpass desktop software. Or they might not. Either way, my point is that we're not there now, and creating software etc on tablets is a sub optimal experience today.