The percentage of electronics at the end of their lives which were recycled.
The EPA found that the percentage remained consistent from 1999-2005. Even as recycling rates went up, the amount of electronics reaching end of life outpaced the increase, leaving the figure static. (source: EPA, July 2008)
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12-20 megapixels...
It is not just optics that needs to be better the size of the sensor would need to be increased, else you'd seriously drown in noise. Also you'd need some interesting storage system for all that data, even assuming you had hardware compression for the video.
Packing all that technology into a mobile sized device might prove to be the downfall of all of this :-)
A lot of HD camcorders are just using SD cards for the storage. With a 16Gb SDHC costing around $50 at the moment, well, the reasons are fairly obvious. Gb/$ ratios are doubling every four to six months with no apparent let-up.
16Gb should easily store two hours of Blu-ray/HD DVD quality video coupled with a decent soundtrack. The issue is not storage right now, it's the other issue you mention - the optics and quality of the cameras in general.