Hoi,
What is the added value of yet another database? If this is about Wikipedia, it will only be a subset. When this data is to be generated, it makes sense to not duplicate a lot of work that is happening in Wikidata. It makes more sense to include the data and work on improving its quality.
The issue with quality in any database is in the power of updating data as it happens. This is true for any Wikipedia, Wikidata and any other external source. We can make Wikidata powerful enough to accommodate nearly every visualisation.
PS if data is incorrect in Wikipedia it ends up wrong in Wikidata. When we have conflicting data we can improve and seek sources to prove a point either way. Your approach will not help quality in the big picture.