> "really hot and just starting out/new up and coming language or framework"

As a consultant this strategy is very smart, very stupid for a company tho.

1) Consultant goes to company and sells his new hot tech stack that is just released.

2) Company buys in and pays a lot of money.

3) Consultant now is locked himself a nice position because nobody wants to deal with this technology and he is the only expert they can get.