Does anyone recall the downfall of Digg?
It only takes another platform to scale out and take the attention away to heavily disrupt Twitter. The Twitter Infrastructure blog has always had interesting posts on what they've been doing https://blog.twitter.com/engineering/en_us/topics/infrastructure and although they have their secret sauce IP on how things work, it wouldn't surprise me if an equivalent couldn't be quickly brought to compete with it. The bigger problem, if it could be overcome, would be financing it.
Biting the hand that feeds IT
