I&#x27;m thinking of Turbo Pascal for DOS. It was very popular, and then it sank to obscurity almost overnight, basically because it didn&#x27;t have any answer to &quot;how do I write a Windows program in this?&quot; Its niche had been eliminated.<p>I don&#x27;t think Go will vanish unless &quot;network servers that run in text mode on unix&quot; somehow stop being a thing. There is no Google product whose change of strategy could strand Go (unlike the others you name). If somehow all computing moves to phones and tablets, it could be stranded, but I can&#x27;t imagine that happening.