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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It's not that simple. For certain types of content, 720p60 is going to look awful compared to 1080i60, especially if the 1080i60 is being rendered by a TV able to see pulldowned content and reverse it. Most dramas and movies are filmed using 24fps cameras. 720p60 does an awful job of representing that, not so much because of the resolution, but because there's no easy translation between p24 and p60.
For other types of content, news programming and sports, i60 is going to be awful. Anything with a lot of movement is going to show up the interlacing on modern TV sets. Want to show a car chase in 1080i60? Expect to see lines as the highway shoots past the camera. Want to show a sporting event? Expect to see lines every time you pan the camera across the field. The only way to get around it is to film in 1080p24, pulldown it, and then hope the TV set will deinterlace the content, but you can't guarantee that'll happen, and the image will jerk when it pans instead of showing the lines.
The really funny thing is that with ATSC it really doesn't have to be "either/or". The channels could switch mode. The problem is they're worried about badly designed TV sets screwing up the change-over. Bah.