I find such stats always interesting because I enjoy seeing who has spun what for why and who is displaying their ignorance, etc. But all that aside there are some important points to be realised:
* while the growth of desk/laptops has plateaued, especially in comparison, it has not begun to point down, the absolute numbers continue to rise.
* mobile devices are in common daily use and in both absolute and relative numbers continue to increase at a rapid rate.
* generally speaking large and small screen devices are not used in the same way in the places.
---Mobile is (generally) used more for real time social, immediate local queries, etc.
---Desktop is (generally) used more in complex and work situations, non-immediate queries/research, etc.
Depending on a site's business model the emphasis for one or the other can vary quite a lot. My sites are all evergreen information sites so attract primarily a desk/laptop using audience. However, because my ads/aff links include time and occasionally locale sensitive coupons, discount codes, etc. I do see an increasing number of mobile device users. Indeed I can almost specify this mobile traffic by locale and time...
Note: I think much of my prior mobile traffic, what little there was, were, given locale and time, bar patrons settling knowledge disputes. :)
One point of interest is that I am increasingly seeing mobile traffic spikes during certain TV shows and also the sharing of certain links on SM platforms during the same time periods. This traffic rarely converts directly/immediately (financially), however:
* the backlinks are appreciated.
* the WOM is appreciated.
* there are analytic results supporting that a small percentage do convert - financially - within a month.
Further, I know some ecom folks who derive mobile traffic surge sales during or immediately after TV shows where a character wears or uses a product/service they supply.
Thus even if one's business model is not primarily interested in mobile visitors the indirect and longer term direct benefits may make considering their accessibility/usability/content concerns worthwhile.