Say you are a programmer and one of those "Rock Star" Programmers always the one being called when things get tough and you have an answer. Then a new guy comes who knows some newer technology, which can solve your problems that you fix better. How quick will you discredit the technology, pointing out any flaw in the system as the key reason why it is obviously inferior. Vs. the more rational thing, of actually taking time to learn and embrace the technology and adding it to your tool box of tools, that can enhance your ability.
I think I'm facing it right now ^^