While I agree that the acceptance of an endonormative model would follow Kachru's steps (non-recognition, expansion of bilingualism, gradual acceptance of local norm, recognition), and is much less likely to happen in an EFL/EC context, or at least to happen more slowly, I also think that the criteria laid out for an institutional variety stacks the deck -- it only allows for a 'real' variety to have characteristics similar to the Inner Circle. (Maybe. I'm making this up.) I'm thinking here of Butler's (1997) making "a standard and recognizable pattern of pronunciation handed down from one generation to another” her #1 criteria, and Kachru's (1992) list of criteria ending with "a body of nativized English literature." I'm not convinced those things are better criteria for a 'real' variety of English than some other things -- for example, the internet wasn't really around when those taxonomies were developed, and clearly that's become one of the most important domains for English.
Anyway, more soon, probably.