Also note that the answer you refer to doesn't say to learn language X if and only if it will let you keep a job/get you a job. It refers specifically to whethe

Also note that the answer you refer to doesn't say to learn language X if and only if it will let you keep a job/get you a job. It refers specifically to whether one should learn C++11. It says nothing at all about the myriad of fun and interesting languages out there that are worth learning for the sake of learning, of which C++11 might not be one depending on ones world-view.