> ...and also look at the growth rates for future demand.
I would say that looking at the growth rate of future demand is a poor way to go about it unless you're also looking at the growth rate of future supply, for the same reasons mentioned in my original comment.
For anyone looking at this list it’s probably the places where demand is growing fastest that you want to target.
From those you could split things into stuff that’s mainstream and upcoming.
Mainstream would be Python, AWS and JavaScript as per this list.
The fastest growing areas as per this list are Machine Learning, Azure and Docker.
A common pattern here is that the in demand skills cluster around front end + full stack (including ops) or data engineering + ML