I think Go language will be taking over the web based development. And as far as the future of the C and C++ is concerned, I think the Rust is about to replace two of them. I don't see much reason for the C/Cpp being used in near future. But I do see the point of Rust being around in near future. I think we will see where the languages evolve in next few years though.
The future lies with functional languages. Processors are multi core and immutability bug counts. In terms of concurrency, functional languages are easier to use then non functional ones. In terms of immutability, functional languages are the best .
I believe that Python will persevere into the future since it has the ability to adapt. I actually do not see much future with the C and C++ languages as better languages would definitely pop up. Then there's Go language that is quite flexible so I believe it would thrive. I expect the future to usher in languages that can adapt to different platforms.