Google Showcases in-Depth Articles

In Google Operating System:  An indication that Google is now showcasing long form articles.   We have become very used to small sized nuggets of information on the web, but we do also appreciate longer, full explanation examples.  That is part of the reason I would sometimes go directly to the Wikipedia.  The WP article often, but not always, would appear at the top of a search.  Is this a way of stealing away attention from Wikipedia as a primary knowledge source?  The post contains a number of good examples from searches.   Motivation further discussed.