I actually hope that never happens RK. My wife and son run all of his business on their laptops. I hate using them. I just hope gamers continue to game so that I can continue to have desktop bits. I like the room to put bits in, no trouble to keep cool and I have a nice big 24" screen.
My mousepad has a photo on it taken from a friends plane of our 4th generation bach at a beach in Golden Bay (read paradise). Brings back memories each time I look at it. 
I'm doing my part to keep desktops alive.
I never game on my phone and rarely on my tablet. I haven't used our PS3 in about eight years or our Wii in about five. The types of games I play just aren't available on consoles, tablets, or phones.
I like the eye-candy cranked up on the games I play, so I usually buy graphics cards close to the high-end that are too big to fit in laptops or tablets. Even if they could fit those cards in a laptop or tablet, where would I put my multiple 30" monitors, gameboard, full size keyboard, and mouse (they certainly wouldn't fit in any kind of bag you'd want to carry around). I've re-purposed a dining room table for my gear and I use the whole thing.
I don't think the desktop PC is going to die any time soon.
