The license working group has published a graphic showing the amount of data that is currently relicensable under CT and ODbL.
Green squares are ODbL, red squares are CC-BY-SA. As I understand it each square represents the square root of the size of each user's contribution. I don't know how the contribution size is calculated, I'd guess it's just a count of the number of nodes that were last touched by a user, which would oversell the amount of data that would really be usable under ODbL. Here's what the LWG published: http://i53.photobucket.com/albums/g51/80n80n/osm/odbl.png But that includes bulk imports and bots, so what happens if you removed those? Here's the same graphic with just the three largest contributors removed (two of which are probably TIGER and AND): http://i53.photobucket.com/albums/g51/80n80n/osm/odbl_cropped.png That's quite a difference. Only six of the top 30 contributors have agreed to ODbL so far and the image is predominantly red. By way of a rather toung-in-cheek contrast I thought I'd prepare my own graphic showing how many OSM contributors have now agreed to CC-BY-SA. In this graphic the green boxes are those who have agreed and the red boxes are those who have not: http://i53.photobucket.com/albums/g51/80n80n/osm/cc-by-sa.png Enjoy. 80n
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