Good. Also glad Google is letting us know a bit more about what these core updates are about. (not that this is something we can control)
I can confirm that this is happening in our niche as domains that once had 3 to 4 listings in a row now have 1 or 2. Most of these listings tend to be from big media brands and a rehash of the same subject but using slightly different keywords. 1 listing would be fine for these lower quality articles.
Still if there are a number of good articles I am not sure why Google doesn't do with articles what they do with forum posts? In the serps they have one listing with the forum topic first with an insert that they feel will answer the questioned. This is followed by 2 to 4 links to other related forum topics that may answer the searchers query as well.
I "guess", that Google suppressed the limitation with the rise of Social networks.
With a "normal" site, usually one page will match a given query, excepting for spamers which are creating plenty of variants of the same page, with the hope to flood the SERP.
With Social Networks, there are so much material posted, that it's highly possible that several , "pages" , can "legitimately" match a given query. Let's take the example of Facebook groups. Two groups can be on the same theme, and so both are legitimate to appear in the SERP, for the same query.
There is already evidence that this (or technically a slight variation) will be an effective strategy. If you read through the twitter thread someone raises an example of "indeed" showing up multiple times. Danny Sullivan responds by saying that these are different domains, since they are from different ccTLD's. So clearly it works, Google says it's not only ok and it is expected. Time to buy up all the ccTLD's for your domain name.
I know it's only been a few days since the announcement broke, so this could explain why we're still seeing certain selected industries being presented twice or three times on pages one, two, and three in the listings.
We'll give it a few weeks to see if there are any changes in these selected industries - I know that a few of these guys aren't going to be real happy about having only "ONE" page being listed.
Let's hope this is properly implemented as I see a number of searches in my niche where the top two results are not only from the same domain but are the same article...
Somehow the intro *and* the article rank separately, keeping us at no 3. If these were two separate articles, it wouldn't be so galling. This would also be much more useful for the user to see three discrete results.