There’s nothing technologically preventing Flickr from shifting to a broad folksonomy, right?

That is, if they were to implement some way to let people tag up an object with their own personal set of tags without destroying the creator’s set of tags then it would be a broad one.

In that case, it seems to me that the only thing preventing Flickr from being broad is that they haven’t gotten around to it or don’t want to place the computing resources into processing all of the extra tags.