Knowledge Graph is the product of modern search engines (or at least the leading search engine, Google) moving away from keywords and strongly towards semantic search. The more users search on Google, the better the algorithm will get at aligning search queries with user intent. Traditional keyword research should no longer be the focus of any SEO strategy. User intent will become the new currency in SEO. By focusing on quality content that is relevant to user queries, branded search terms and related questions, the cost of technical implementations vs. increase in traffic is worth it. In fact, incorporating schema.org markup used for Knowledge Graph can move your rankings 1-4 places in the SERP.