Rust will never work except in niche areas because it doesn't allow for easy experimentation and does not provide an iterative workflow like Python, R, or Julia.

I think the future is Julia, as it's as easy to write as Python, is interactive, and can be compiled for fast speeds!

It will just takes time for Julia to have as many libraries, but at some point the tipping point will be reached, and Julia will just eat Python's lunch.

Python was dying before the latest wave of data science and machine learning craze saved it anyway. There are pretty good reasons to believe Python (and Ruby) will slowly wither away. I am careful not to savy that they will die out, because they won't as some computing problems do not require so much speed and hence Python and the like can still pass mustard. But in a post-Moore's-law-world, data is getting bigger, the demand for computing is larger, but programs aren't getting faster, and there is a limit to how much you can optimise Python. Eventually, a crop of speedy and easy to write programming languages will rise up and eat Python's lunch. The early signs are there with tools like Julia.