My working hypthosis is that the software industry, and in particular SaaS, has seen immense growth and it's unlikely to see that kind of growth again. It's unlikely, but not totally impossible, to see the rise of something like Microsoft, Apple and Amazon again.
So, if you were at a stage of your career where you're trying to find interesting fields and industries that might see huge growth, where would you look?
I landed myself in a shop that sells, essentially, tiny locally-networked systems of specialized Linux boxes. Yes, our core offering is running on the JVM, but all along the edges there is just so much Bash and PHP.
I don't think I'll ever work in a place again where I have this much opportunity to become a genuine old school shell and webshell wizard again. I want to master the Primordial Arts, their endless exceptions to exceptions, and come out the other side as a true master of something completely fucking ridiculous.
I did it once with Microsoft PowerShell. I can do it again.