There are issues with the execution of this model but the most important one is a cultural one; when you work with data to generate stubs, there are benefits to concentrate first on Wikidata. The biggest benefit is that the data is integrated from the start and a close second is the ability to easily use it in another Wikipedia and maybe in Wikivoyage as well.
At this stage of the Wikidata game there are important issues:
- many datatypes are not yet supported
- many datatypes cannot be imported yet with a bot
You may find that the data already exists in other projects and you are likely to find differences. Finding these issues and curating them is crucial to all of them. The trick is to make sure that this is done only once and, this is where Wikidata shines.