Some think that the number of pixels defines sensor technology. That's why we had megapixel wars, because the uneducated masses think that more is always better.
It's a constant struggle from two opposing sides.
I shoot with a T3 right now, a lowly 12MP sensor, when I compared my first shots with that camera VS an old SD780IS (same resolution), I was astonished at how good it looked. Obviously the bigger sensor and more modern technology made a big difference (one point for low resolution sensors).
At the same time, when you look at some comparisons of high density crop sensor cameras VS full frame of the same resolution, if the lens is sharp enough there isn't a whole lot of difference. There's obviously room for higher resolution (one point for high resolution sensors).
On the other hand, I usually downscale my images by about 75%-90% before showing them to anyone, so asking "what's the point" seems quite valid, and has stopped me from ditching my now ancient, inferior sensor (two points for low resolution sensors).
If I'm going to have an SLR that produces such nice images though, it would make sense to have nice prints made of a few of my best shots at some point in the future. I would want a big expensive high quality print to have as much detail crammed into it as you can manage (two points for high resolution sensors).
Continue ad nauseam.