But is that because you like Python, have a large code base that takes time to convert, is missing some tools, don't think javascript is mature enough or something else?
I use C# myself and would not like to convert our whole app to js but I could be ok with Dart or TypeScript instead (or Go but that is not a scripting language).
I didn't argue JavaScript is #1 on the server side, simply that it's the language with the most traction when it comes to that group of languages (of which Python is no part by the way, PHP and Ruby are though). I wouldn't touch JavaScript on the server side with a 10 feet pole.
(edited for clarification)