Sadly, people very much do care about exclusivity, to the point you’re called cheap if you don’t agree with them and want to share the stuff you own with someone else.
I mostly disagree with exclusivity – there are a few corner cases – but it looks like people like you and me are outliers, because Funcom clearly seems to have gotten the message from the playerbase that exclusivity is important. I mean, it’s no coincidence that they sent out a really detailed (and rather invasive) survey and some time later we got this new monetization system.
Getting back to your topic, I have a hunch that some of the stuff from the BP might end up in BLB, but not until the whole Age of Sorcery is very much done and has become old news.