Wow, shots fired here for me.

I was ahead of the game with my intimidate expertise in ActionaScript and Silverlight! I made 3D engines in browsers well before WebGL was a spec.

It was quite profitable for a few years, then poof. Dead end lol

Shockwave director studio even!?

I think these ideas are similar to long-term relationships. Identify when it's clear it's worth your time, like the author, and commit appropriately, and then when it's time to move on move on.

AngularJS, Backbone, Knockout, YUI, were all a wave of pretty groundbreaking frontend technology. It was absolutely worth experimenting with and committing to once they had some uptake, but probably not before then unless you wanted to work on the teams building them. Time went on, they had years of longevity that overlapped with the next wave of Vue, React, and the rest, and those became worth investing in long-term. Along the way, fundamentals in underlying web technologies were crucial, programming, logic, networking, markup, design.

Actionscript was totally worth investing in, until it ran it's course, and then other things came along and you would have adapted your game programming and engine programming skills yo a different platform.