They suffered from the VM rise of Java and CLR, finally we are circling back to AOT tooling and FP concepts are becoming mainstream so advocating them is easier nowadays.

Also these things take time, even C++, I saw recent presentations from BMW[1] and Sony[1] that only now in 2017 they are transitioning from C to C++11 (not C++14) for some specific embedded development.

[1] - https://fosdem.org/2017/schedule/event/succes_failure_autono...

[2] - http://sched.co/9OOs