Re https://meta.wikimedia.org/wiki/2015_Strategy/Community_consultation#The_que... and given https://commons.wikimedia.org/wiki/File:Strategy_consultation_qualitative_co... was already published from previous answers, I prefer to answer here:

What major trends would you identify in addition to mobile and the next billion users?

I predict a continuing arms race between paid advocates and opponents of bias. (File under the fourth line item from the graph above, "Neutrality & POV.")

Based on the future trends that you think are important, what would thriving and healthy Wikimedia projects look like?

I imagine a world in which http://mediawiki.org/wiki/Accuracy_review is supervised by the WikiEd Foundation, with funding from the Wikimedia Foundation e.g. https://meta.wikimedia.org/wiki/Grants:IEG/Accuracy_Review_of_Wikipedias with WikiEd hiring the volunteer doing the work so I don't have to pay her.

Sincerely, Jim