It's not just that you're old and burned out. There is a declining marginal value of improvements.

Take sound, for example. Going from "no sound" to "sound" was huge. Going from just beeps to IBM PC sound was a real step. CD-quality was a real step. Going from CD-quality to 64-bit samples at a 1 MHz sample rate is a yawn. Nobody cares. The improvement on CD quality isn't enough to be interesting.

I have high enough bandwidth. Enough screen resolution. Enough RAM, enough CPU speed, good enough languages freely available, enough data.

The problem is, everything that was an easy win with all that has already been done. All that's left is things that aren't all that exciting to do.

(I don't think this is permanent. Something will come along eventually - a new paradigm, a new language, a new kind of data, something - that will open a bunch of doors, and then everything will be interesting again.)