This is purely my point of view. I am neither a veteran programer nor one by training, but here it goes:
when there is a new problem to solve - this could be a new innovation in any field associated with technology : COBOL was developed for one specific set of problems in mind, the same with Julia
When the said language that has been developed no longer works for various new problems that arise. So, either the problem that it was set to solve completely diverges or new problems arise so rapidly that the language development can't keep pace with these new problems
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This is purely my point of view. I am neither a veteran programer nor one by training, but here it goes: