Assuming you're aiming for "pretty productive and can get a well paid job with any of the languages you know", note that skill in programming is, but one dimension in the employability equation. A handful of others include: domain-specific knowledge (both technical, and those specific to the employer's industry), communication skills, ability to juggle tasks, and ability to sell. Strength, or lack in any one, or combination of these skills can be an overriding factor in your pursuit.
You'll often find on these boards, and in software circles people very noisy about language of choice. This has historical, sunken-cost-fallacy, and mid-carrier-crisis backgrounds; none of which are particularly productive to your goal. You'll also find many posts claiming shiny features achieved in one particular language. This has marketing background, and is also not conductive to employment.
In conclusion, given your stated goals, your question is a red herring -it serves to distract you from what you're trying to achieve. It is possible to be very good in multiple languages. You might even aspire, and reach this goal within 3-5 years. Whether the industry will need those skills, and whether you'll be employable in any of these, are separate questions entirely.