Geek question: Memory cards versus DVDs

So, I'm comparing DVDs to various memory card technologies, and the more I look at them, the more it looks to me like the memory cards are, in the long run, a potentially superior technology.

They seem capable of similar capacities to that of DVDs (possibly more), they are less vulnerable to, for instance, scratching, and some are capable of writing at least as fast as DVDs, and certainly faster than the new HD DVDs and BluRay DVDs, if I'm reading my number right. And, they're smaller and thus more portable.

So, why aren't they replacing the DVDs? Is it because they are less permanent?

Crappy crappola crap crappity crap

... is approximately how I feel.

With weaning off the antidepressants, my tendency for insomnia and poor light sleep has returned. Some days it doesn't seem a problem, but other days (and the last two nights, even after going to sleep early) it has been bad enough that I feel pretty crappy right now. I know I just need more sleep, but ugh. Achey legs, achey eyes, lethargy.

And, there's no rest for the weak. I have to write up more details to confirm the article with TTS, and do background research for the article for HS.

Today I have alternated between being extremely pleased with the way things are progressing professionally, extremely anxious about getting all of my social, professional, and personal obligations done, and crappy. It's not all bad, and the worst parts are the ephemeral ones. The good things are things that will last.

Good news is, the day is almost over. I will go home, loaf, and then go to sleep early (hear that self? Early!). Somewhere in there, I have to write up those paragraphs. The research for HS will have to wait. Right now the TTS article is just a higher priority.