I can see different reasons one could desire a package be opened:

a) Because it's just plainly required to get the N900 working with anything other (including Meego) than stock Fremantle
b) Because it would help development of a saner alternative that would work on other platforms (ex. document cal area, open mce, bme, etc.)
c) Because it is under documented and someone wants to use it
d) Because the component has a bug that Nokia has refused to fix and a person thinks he's able to fix it.
e) Because the component has a pending feature request that Nokia has refused to implement and a person thinks he would be able to add the feature.
f) Because someone thinks the component is useful for something outside of the Maemo/Meego/Maemo devices scope and wants to maintain it
g) For the sake of it.

(Difference between a and b is that a could be satisfied by just a proprietary but freely re-distributable solution. problem b cannot, because the nokia binary would be incompatible with random distro, etc.).
(c d and e are indeed similar).
(f is e but with a much larger scope -- not only fix a few nuisances but potentially make it a gnome component or something).

Now -- media player would be an example of (e) (and potentially (d)). According to what's been said, what incentive might Nokia have for releasing Media Player? None whatsoever. So I understand that releasing it is a difficult decision for Nokia.

But releasing an entirely new, different Music Player source, albeit praiseworthy, does probably not answer what the requester had in mind.