Sunk cost or costly effort? There are a more than a handful of large of technologies, frameworks and libraries used in my industry which would have to be ported

Sunk cost or costly effort? There are a more than a handful of large of technologies, frameworks and libraries used in my industry which would have to be ported/rewritten and supported from C++ before anyone would think twice before using an alternate language. Particularly when speed is the name of the game (in terms of integration, not just compiled binaries). There are hundreds of C++ libraries employed daily that would be non-trivial to port.