With the worldwide network of PROs gradually migrating toward some type of detection technology, this could become a major issue and a lot of royalties could be held in limbo, or not be paid at all. And you might never even know about it if it's ocurring somewhere overseas.
So if fingerprinting becomes the way to track placements, it is possible that songs with two or more publishers would not receive any PRO royalites for either publisher or any songwriters.
If this is the case, direct licensing through a music supervisor could also be affected. It would not make sense for a composer to have a semi-exclusive cue with a music library. If the same song were licensed by the library and then directly licensed through a music supervisor, both the songwriter/library publisher and songwriter/publisher could lose out on money.
There is so much information to consider.