For reference: The Wikicite roadmap document from Wikimania 2018: https://www.wikidata.org/wiki/Wikidata:WikiCite/Roadmap
Significant progress has been made towards the goal of representing sources as structured data, through the creation of Wikidata items for works cited across Wikimedia projects, the design of a range of bibliographic data models in Wikidata, as well as the creation of bots and tools (1 - 2) to support these workflows. Major gaps still exist to date — we have yet to ingest, at scale, sources other than academic/scientific papers (such as books, newspaper articles, web pages, TV/ radio, etc. and their authors) — but the project is making progress towards this goal.
The notability of these items, supporting their inclusion in Wikidata, has been long established by community consensus.