Hi,
As we seem to be committed to using RPM now, the idea of a OS2VOICE rpm server seems good. There are programs such as FFmpeg that have many dependencies and could really benefit from a package manager as well as many programs where installation could be simplified by using RPM. OTOH, long range plans for ANPM include better support of WPI packages allowing them to co-exist better with rpm, so no need to totally drop Warpin.
Problems come from what exactly are the Dutch (and EU I guess) regulations. Copyright is complex enough with different jurisdictions having not quite compatible copyright laws. eg, a bunch of stuff just entered the public domain here in Canada, but in many jurisdictions, including the States, they're still under copyright. There's also differences in what can be copyrighted, some places a recipe can be copyrighted and others, not. Same with headers, their copyright status is not clear and is likely to vary from jurisdiction to jurisdiction and without a court case can be really unclear.
Then there are corner cases such as the discussion on cdrecord where strictly speaking, it seems copyright is being broken by distributing Froloff's patched cdrecord without source so no GPL licence. There's lots of stuff on Hobbes that likewise is probably a copyright violation but as long as the authours don't complain, it is fairly harmless.
More important when talking about multimedia applications in particular are patents. A lot of this stuff is patented and American law, as an example, is pretty strict in enforcement, as well as pretty liberal in what can be patented. I have no idea what the Dutch (and EU) regulations are on these patents and I'm not even sure about my country.
Debian, for example, gets around these problems by having non-free repositories hosted in safe countries, same with projects such as MPlayer. Then there is lame, which simply only distributes source code as it seems it takes a binary to infringe. This also opens up the possibility to compile some software on the users machines to work around these problems.
Last, but not least, is with an expanding number of repositories, is keeping them in sync to avoid RPM hell.