The blacklist is now hardcoded in the Wikibase-configuration file. It would be better to make a MediaWiki-page for it, so the configuration file can fetch the blacklisted properties from that page. This way we don't need to make requests here every time.
Due to missing simple queries, I will make a list of all Properties having 'obsolete property' by analyzing a dump with wikidata data. But then it's not nicely and dynamic. But at least you don't have to research them manually.