cognitive psychology. PhD 
I train Rust since 4 years (Meetup, Hack & Learn and actually as a paid trainer for 3 years now) and I _hate_ it when people bring up "learnability" in language RFCs. Most of the time, it's a bit of anecdata, scrapped together.
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The core challenge is understanding learnability in a rigorous but efficient way. Most people don’t have time for user studies, teaching courses, following students, etc so we rely on our experiences and intuitions. Surveys at best.
A symptom of this in academia is the propensity to use lines of code as a usability metric. “Examples in our system are avg 50% less LOC than leading competitor. Therefore we are more usable.”
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I think important research can be done here. Identifying lightweight methodologies that have higher correlations with usability (whatever that really means...) and seeing if they can meaningfully influence system design in practice.
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Interestingly, I've been part of a university study that used large hackfests with a set goal to measure productivity. They found no correlation between verbosity and development speed. Sadly, I even forgot the name of it :D.
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