Ok but it isn't true that there are no brown languages that are loved. So the interesting exercise is to try to figure out which green languages will remain loved after they turn brown! Obviously this is hard to guess at.

My guesses from the green list: I think Kotlin and TypeScript will remain loved; they solve a real pain point in a simple and well curated way. I think Scala will be dreaded (actually I would already put Scala in the brown category). I think Haskell will remain both loved and dreaded; I think it's a bit different than the rest, because I don't think people mostly dread it because of maintaining old systems, I think whether or not it clicks is just very personal (I'm personally in the "dread" camp on it, though I appreciate many of its ideas). I don't have enough experience with Dart or Julia to make a guess.

The most interesting questions are Go and Rust. My intuition is that I think Go will be like Ruby: quite nice to start with, but increasingly unwieldy as projects get bigger and bigger. I do find it pleasant to hack on small Go files, but would dread joining a project with millions of lines of code. Rust could be dreaded as the C++ of the future, known for big unwieldy difficult to maintain codebases. Or it could be loved as the much better C++ of the future, known for making big unwieldy difficult to maintain codebases more tenable and enjoyable to work with. I'm not sure!