Programming is a task. The language is a tool you use to accomplish that task.
Just like any task, there are many ways and many tools you could use to accomplish that task both correctly and in a timely manner.
For example - Should you learn to use a hammer or a nail gun first? It really depends on what the job calls for but you are probably encouraged to continue to learn about any tools that can get the desired result.
In our company we generally hire people who have demonstrated the ability to learn multiple disciplines even if the one we are looking for isn't their strongest one (so long as they are proficient in it). Learning something is never a waste of time. You know what you can do and what is comfortable for you. Some people can pick up complex languages with relative ease, others need to wade in. The thread has given many opinions from people who work in your targeted industry (or claim to at least). The choice remains yours in the end however and your success will ultimately depend on how much you are willing to change and adapt to the employment environment you are seeking out.
It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is the most adaptable to change.
~ Charles Darwin