I agree that it makes sense that one of the first things to do when creating a new wikipedia article should be to create an infobox which is automagically linked to the creation of a wikidata item. There are a number of considerations related to this.
1. Notability. The current rules for Wikidata means that it is not acceptable to create a wikidata item until after the Wikipedia article has been created.
2. Drafts. English Wikipedia has recently enabled a Draft name space for people to use to develop new articles. Articles in the Draft namespace are not indexed by Google and are not required to meet notability standards until they are transferred to the Main namespace. Should we change the rules on wikidata so Draft articles can be sitelinked and have wikidata items?
3. Visual Editor. The visual editor already has some template editing functionality but it does not link to a wikidata item. To get Wikipedia editors editing wikidata we need an infobox creation wizard which will mean wikipedia editors can edit wikidata from inside wikipedia and it feels like they are editing an info box. Personally I think the first step should be to enable the wikibase client on wikidata so we can start developing these internationalised and localised infoboxes on wikidata which can then be redeployed to other WMF wikis.
Yours
Joe