Being aware and trying things is one thing, I meant more a seemingly cavalier attitude of taking all your eggs out of an old technology basket and putting them in a new one, with slim justification.

And then there is survivorship bias. What if by some strange turn of events, ColdFusion had continued to evolve and eaten its respective niche? While I wouldn't condone an attitude of not being open to new things, the ColdFusion stalwarts would look like sages, while people who invested in an upstart technology could well have wasted a lot of time.

The move "backwards" to older, more mature technologies happens often enough, too. Startup uses latest NoSQL thing, and then realizes an old timey SQL database would have saved them a lot of trouble, etc. It cuts both ways.