Obsolete is a bit of an exaggeration. As far as I know, almost all programming (including for mobile devices) is still done with a keyboard and a mouse, and I honestly don't see this changing anytime soon (the only way I personally can see changing this is if voice recognition combined with enough AI to make dictating instructions to a computer a reality... or if a visual programming environment actually succeeds, despite its historically lousy track record except for certain niches).

This is also as far as I know still true for a lot of other productivity-type uses of computers -- even though mobile and tablets are also used in some of this space, they often seem more auxiliary. Most of the serious professional tools for, say, business (eg spreadsheets, accounting, inventory, etc.) or even artistic uses (music, photo editing, etc.) also are primarily keyboard / mouse oriented. Tablet oriented tools definitely exist (especially in the art space), but a lot of times its not a primary use case, except perhaps in communication tools.

Mobile space is a walled garden, designed more simply for limited real estate and touch, with more difficulty to poke around (there is no real equivalent in the mobile world to open a web site, hit F12, and poke around). That's fine -- PCs / laptops haven't disappeared, and if a kid showed an interest in programming, you'd get them one. :)

Now, the original poster may have been referring to the new world of social. I did more enjoy the long form of social (eg blogs) that popped up in the 00s. Versus the current social world, dominated by only a few firms that are highly motivated to manipulate your feed, tweak your emotions, and optimize the dispersion of ads (and other low-quality tabloid junk). It's my "old man yells at cloud" pet peeve, I suppose. Not exactly a mobile device problem, though.