Comment by bshipp

This seems to be a trait of humanity in general, not just IT. Look at the finance industry: banks loan based on historical track records, right up until the bubble pops. Every. Single. Time.

Momentum lends itself to easy statistical support, and paradigm shifts are notoriously difficult to predict with any degree of confidence.

No matter how long in the tooth a particular trend might be, matter how certain you are that a reversal is imminent, it's hard to push against the weight of trend-line evidence.