I would be careful treating this too much like a popularity contest. Python will still be used 20 years from now, but that doesn't necessarily mean that it's going to be dominant 20 years from now.
Source: I used to do a lot of programming in various dialects of Basic, which, a bit over 20 years ago, was popular largely because of its own ubiquity and popularity. And, while I still maintain some Basic code, I was surprised how quickly it died. One day everything was being written in it. The next day, we were were writing new things in a fancy new language that everyone agreed was more productive, and talking to the existing stuff through an FFI. And, a day later, we were replacing modules in order to get them off of the "legacy" platform.
Source: I used to do a lot of programming in various dialects of Basic, which, a bit over 20 years ago, was popular largely because of its own ubiquity and popularity. And, while I still maintain some Basic code, I was surprised how quickly it died. One day everything was being written in it. The next day, we were were writing new things in a fancy new language that everyone agreed was more productive, and talking to the existing stuff through an FFI. And, a day later, we were replacing modules in order to get them off of the "legacy" platform.