I recently had the displeasure of reading an article whose sole purpose was to present the "danger" Twitter faces because its use-rate has plateaued. If you really want to you can read the article here: Personally, I think that CNN has taken a turn for the worse if this is what they find themselves writing about. I mean honestly, will the world really change if Twitter was no more? Or if people stopped signing to the micro-blogging site? The answer to those questions is simple: No. Understandably the website is a pleasant little medium for people to post their daily opinions and shenanigans, but without such a site people will still get on with their lives.
Now for some shameless promoting:
Follow me on Twitter and come give my band a listen: River City Extension