Gaming drives personal computer development.
The mouse and keyboard are Still the fastest, most accurate way to navigate 3D environments on a computer.
Most games these days feature 3D environments, and though all the new VR toys are cool, they are giving people the same adverse reactions as 3D movies, which most theaters now only give a few slots to, and mainly show the 2D version (people suck, what can I say. Thin the herd.)
Therefore, 3D game environments depicted on flat screens are in no danger of disappearing any time soon.
This means the mouse and keyboard control method is also not going anywhere, any time soon.
When touch screen laptops and combo tablet/laptop devices came out, everyone said the Keyboard and mouse were dead.
But not many of those sell anymore, the iPad being an exception. A touch screen with your fat finger on it simply doesn't have the accuracy required for Many device uses and a Lot of software.
Sure, you can carry around a touch pen (I carry 3, because they get lost so easily), but that's annoying, even if you have a case like mine with a holder for it.
And the real killer, even With a pen (which completely removes the interactive touch experience) is Still not as accurate as a pointer on the screen. And you also can't see what's under your finger or pen... Or what's behind your finger and hand.
This makes touch computing worthless for many computer uses.
Try doing pro photo retouching, graphic design, video post production, 3D modeling or texturing, sound engineering, or just plain drawing or painting digitally, etc..
Sure, in some of those cases nothing beats a tablet and pen, With the keyboard. But for many, many computer uses, including the use that literally drives personal computer advances, the mouse and keyboard are King (and special mice, like the 4D Mouse, are still mice).
Touch is Great for special circumstance computer interfacing. Such as on phones, phablets, and tablets.
But none of those devices have the versatility or power of a PC. And none of those devices is the Best at doing Anything a PC can also do, except perhaps making phone calls, taking okay photographs, or in the case of tablets, being a portable entertainment device, or a bargain basement Point Of Sale device.
Everything else... The Real Work, like coding, design, office work, gaming (😁), is done much better by a full size "gaming" PC, or a Gaming Laptop (calling a system a gaming system just means it's the best and latest tech they have. Games Push Development.), with a good laser mouse, and a quality keyboard (either a good gaming keyboard, or the excellent Microsoft Ergo 4000), Period.
BTW, a quick word about my knowledge level.
I've used computers since the mid 70s, before there were CRT monitors. I started using them professionally in 1981. I have been a designer in every sense of the word, an a digital artist, and all sorts of other titles they give you when they stop letting you Create, and force you to think up stuff to tell other people to create.
and I've been a Video Gamer since the Video part was ASCII characters printed out on a teletype terminal.
I am currently a part time game development consultant and tester.
I once doubled IBM's income with One creative project. And I've done more unbelievable things than that. My user name is a Big hint.