Regarding the template: it needs changing anyway because it can at the moment actually discourage some people from adding their images to Wikipedia.
Versions in some languages say something to the effect of "our volunteers will add your photo to the articles shortly", while in most countries there are no volunteers specifically working on adding new photos to the Wikimedia projects.
Regarding a blog post: that's a great idea, we'll think about that.
Yet, at first glance, its realization in the international context faces the problems of universality. The most obvious one is a language barrier. Such a help page would be needed in many languages, which requires lots of translation. A more subtle one is the difference in requirements by different wikiprojects and their language editions. In some wiki it might be okay to add a gallery of 10 photos to an article about a street, but that might not be acceptable in other projects.
I'm sure we can deal with these problems, but that would require time and sufficient involvement by the international community.
Project Manager at Wikimedia Ukraine