| Once you get out, it starts getting harder and harder to go back. Further, the longer you stay out, the more likely you would have to retake classes that you already have taken.
It's always worth learning more, and giving yourself a few extra options for the future. On the other hand, an older degree (if you change careers ten years down the line, say) isn't as compelling as a recent one in the application process.
I'd probably go with the double major and consider the extra year well worth it, but if you don't want to commit to that much just yet, speak to your advisor and find out what additional classes the second major would require, and take them as electives. Plan for completing your primary major in one extra semester, and that way you'll have the flexibility for change between now and then. | 
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