I don't think fandom itself is dying - I think it may be changing from how fans used to interact with one another however. The Doctor Who fandom for example is definitely live and well.
I also don't think the internet has become less interactive - the whole point of Web 2.0 applications is that everything becomes MORE collaborative. Everything now is about generating content, becoming an author, adding to what was already there. Most fandoms now have their own wikis that anyone with a computer can ad to and edit. That forums aren't as big a thing anymore doesn't mean that everything is less interactive. Look at memes. Look at tumblr, facebook, twitter. Everyone has an opinion, and nowadays it seems like people express this opinion through videos on youtube, through memes on tumblr, through random posts on facebook, and through the creation and updating of wikis and their content.
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I also don't think the internet has become less interactive - the whole point of Web 2.0 applications is that everything becomes MORE collaborative. Everything now is about generating content, becoming an author, adding to what was already there. Most fandoms now have their own wikis that anyone with a computer can ad to and edit. That forums aren't as big a thing anymore doesn't mean that everything is less interactive. Look at memes. Look at tumblr, facebook, twitter. Everyone has an opinion, and nowadays it seems like people express this opinion through videos on youtube, through memes on tumblr, through random posts on facebook, and through the creation and updating of wikis and their content.