Some of the things I would love that the Julia ecosystem gets are:
What would y’all really appreciate if it gets added to the ecosystem?
Julian symbolic math libraries.
YAML library with read/write support.
I really wish something along the lines of BeautifulSoup existed for Julia (perhaps it does — I haven’t been able to find something after a bit of Googling). Seems like a natural fit for multiple dispatch, depending on how the HTML elements get handled.
BS is such a pleasure to use for simple web scraping and navigating the various HTML tags and content.
Camera calibration: something like Matlab’s own package, Caltech’s old one, or something completely new.
Default summary stats and plots for every model I use (like in R). R taught me that it’s not about having a good plot at first, but just looking at something so you can start making a good plot.
https://github.com/BioJulia/YAML.jl
Might need some love and only just for reading at the moment, but maybe you can take the TOML.jl package as a reference…
https://github.com/JuliaLang/Pkg.jl/tree/master/ext/TOML
Have you looked at
https://github.com/JuliaWeb/Gumbo.jl
and
https://github.com/Algocircle/Cascadia.jl
?
Better support for multi module packages. Maybe better AOT facilities/Options 
There’s Gumbo.jl that I’m aware of.
I want SQLAlchemy.
A more accessible interpolation library than Interpolations.jl especially with (more) support for uneven grids.
Double bump. Down with SAS.
Meta-analysis (such as the metafor package in R).
Multiple Imputation.
Ability to run random-effects regressions, bayesian analysis or survival analysis with larger than RAM datasets.
Larger than RAM visual table editor (not just viewer) and generator.
Something like RStudio, without the slowness of Electron/Atom.
https://www.julia-vscode.org/
?
Would also be great to have it browser-based so it plays well with Docker containers?
“Implement multiply-add interface in LinearAlgebra #29634” - https://github.com/JuliaLang/julia/pull/29634
I believe all the fancy new remote stuff that VS Code shipped recently should make the VS Code extension work with a) WSL, b) docker containers and c) remote machines via SSH. Haven’t tried it, but that is at least the theory.
I did see it once. Some container had the option to instantiate Jupyter/RStudio/VS Code. I am still transitioning from Atom/Juno, but yeah. I have seen it if memory serves me right, but need to find how it was done.