Ivo-
choises: eighter the languge is not importand and has not much articles (in this case their can not be much interwiki-links to that language) or it is important and has much articles.
Having many articles does not make a language important. With some basic Klingon skills I could get the article count up to 30,000 by translating the US census data. Furthermore, most conlang Wikipedias will effectively be abused as dictionaries for their respective languages, and if a very dedicated conlang inventor like Sonja works on the wiki, they can easily get to a few thousand definition "articles" in little time. Hell, my own infoAnarchy wiki has 3100 pages created by a handful of volunteers. That does not mean it is an encyclopedia, nor does it mean it ever has the potential to become one.
I'll create a page on Meta for voting on new language Wikipedias (and I would like for a vote to be also applied to Toki Pona). That seems like the most reasonable solution to this problem.
Regards,
Erik