I'd disagree that there is a causal relationship here. I think most of the outreach to indigneous languages has more to do with politics and ideology than anything else (Wikimedia sees itself as a global movement to collect all knowladge. Can't exactly claim that if its all english).
As for abstract wikipedia. I think that is more a moonshot project driven by people wanting to make the next wikidata. I suspect a major part of support for it is that they can use alternative sources of funding for it (grants).