v1.12 already has merged binary trimming, so we have cases with a full ODE solver that's not 10's of MiB (mostly linear algebra BLAS stuff left), and hello world is 900kB. See https://info.juliahub.com/blog/new-ways-to-compile-julia-blo.... It should release in like 6 months.
Nice, that should help with the nonsense relative-performance-test people run that pans Julia due to the load-times. I suspect it scared away a few potential users evaluating the utility of the language.