There are some new(ish) languages that are rising fairly quickly, like Kotlin, Rust and Go. Of these, Rust is the most like C++, but also arguably the hardest (and most interesting).
But for 10 year plans? Between those three and C++, I am most confident about C++ being ubiquitous in 10 years. [Source: in 2018 there are still 1000+ jobs for Fortran and Cobol on LinkedIn.]