Template metaprogramming is not something new, it's old, and indeed much of Modern C++ (e.g. constexpr) is made to replace the complicated TMP with simpler and just-as-powerful abstractions.

Can you name another language that supports the many high-level abstractions that C++ supports (OOP, generic programming) while being just as fast? Only D and Rust come to mind, and they are neither as fast nor, crucially, as well-developed as C++. The amount of resources and existing code in C++ is staggering. Newer languages such as D and Rust simply can't compete.