It might also be useful to compare L1+L2 vs L3-L7, ie how much can be rebuilt for using on a beagleboard, Mer etc. However there are a few complications when counting closed dependencies:

• some like libjpeg6b & libspeex1 can (presumably) be replaced by their upstream open counterparts with just some performance loss.
• some are softer than others (eg modest can be built without exchange/nokia messaging support).
• some are just "content", not code (eg osso-rss-feed-reader-list or hildon-welcome-default-logo).