Okay... I grok all that's been said, but query to OP ... where's the "referrer data" part of the subject in all this?
Hummingbird is more of a mach schnell in serp returns (by ignoring/and or returning like previous, etc. ie. common denominator taken from crowd sourcing).
HB also looks at the singular, ie. the "widget" and cares not a fig if there are 32,000 colors of the same offered by a site... that is, the site gets one page to hit instead of the 32,000 pages.
What the sellers of widgets need to do from here on out is have a really outstanding widget page leading to a check out (the site's time, noindex,nofollow,hecknotevenseenbybots) eCart.
Every widget page counts... and all the variations of same won't be seen.
G (and believe it or not B and Y, too) will say this is not dumbing down the web. Look! We have better returns!
Reality is the algo is getting strained, there's just SO MANY sites out there, with more coming on line every MINUTE, that G is terrified to miss anything. They must keep slogging away (including referers). Bottom line is a serp needs to be returned and I'm seeing more simplicity. Instead of widget red, widget blue, widget green, of the old days etc. the new return is "widget", if returned at all.
I think the newby sandbox of a few days after robot discovery will continue, sincefinding "new" is the bread and butter of keeping sellers and publishers alive to fuel the robots (of B, B, and Y, etc.) insatiable hunger... but if that magic moment of top view doesn't take off... hello -400!