You make it sound like Ada stopped in the 80's.
They don't release standards in rapid succession but 'Ada 2012' has pretty much all of the features that people were asking for in C++ since 2011.
The only issue (on top of the obvious lack of coolness and hype around it) is that professional grade Ada compilers/toolchain are still quite a high cost for single developers or small companies. AdaCore's business model is still pretty much focused on support contracts to big Aerospace/ATC/Defense clients.