Didn't I say something about special needs and average needs in the OP?
And what is the average needs of a PC user?
But let's rephrase the topic: Are you generally statisfied with today's computing power? I am, maybe I am way older than you are, or less needy.
If you're happy getting the bus compared to those who want to travel in luxury, then sure... you'll be good for the next 20 years.
The internet is plenty fast, the HDs are big enough, movies look gorgeous, games play nice, video chat is life like. What else most people need more???
4K TV is just around the corner - which will do for HD what HD did for SD.
10 years ago it would have taken days to re-encode a movie from one format to another - and now takes just hours or less.
Games played nice 10 years ago... they just play nicer now.
And the realism in 10 years time will be far superior.
Let's repeat, what is it what you want more from the machines?
Better graphics, more immersive gameplay, better AI, more environment-interaction... etc.
The more polygons you can put on screen without deteriorating the game play (slowing down fps) the better a game can look.
The more independent objects you can put on screen the better - noting that each object can interact with every other object... so each additional object becomes increasingly demanding of the computer's resources.
Those objects need to interact in a realistic way - which requires improved physics engines, which requires increasing processing speed.
AI, probably the biggest let-down in most games, also requires massive resources to get right, otherwise you get odd behaviour, and seemingly stupid behaviour.
Some games, such as Skyrim, boast vastly improved AI, graphics and immersion... but NPCs act the same, look the same, talk the same etc (some variation, but not significantly)... and there are still only a relatively small number in a fairly sizeable realm.
The ideal is a game that you can't easily tell that it is not "filmed on location", and with lifelike characters, responses, and realistic numbers of interactive characters. Not to mention the vast improvements required in environment-interaction... where you can go and pick a leaf... any leaf... off a tree, for example; where you can run your hand in a stream, pick up a stone and try to skim it across a lake. Not because you need to, but because you can.
Games will not reach these lofty heights, possibly ever but who knows.
But designers will strive for it, will push the boundaries of the hardware available to them.
But feel free to continue doing only the same as you're doing now.
The rest of us will enjoy the ride to whereever it may lead.