While not providing a clear cut answer, this is a recent related article: codementor.io/blog/developer-reten...
"...Developers are very valuable. A recent study from Stripe and Harris poll discovered that a majority of C-Suite execs agree that the survival of their companies is more dependent on the availability of high-quality software engineers than the availability of money...."
That being said, I personally believe the range will spread; both up and down.
Down: Generally scripting / automation. Think Excel/Powershell general tasks. I imagine this being rolled into a 'bonus' on top of a basic salary.
Up: Software Engineers (Career), Full stack, Engineering Team Leads, Systems Architects. The high end for software I see reaching into the lower six figures with engineering specialist / seniors reaching 200k in the next 30 years.
This opinions are not factoring inflation, 2018 dollars here.
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