Why don't you give yourself a hard deadline to quit by and do this?
I could see quitting and doing this now appealing, but could it also be that since you are now 30 you are sort of going through a quarter life crisis of "did I waste my fun 20s?"
I think I would take this career opportunity and see if through until you are 33 or 34 and then go travel. How big of a career opportunity is this, once in a lifetime? You would have this on your resume then showing 2 years which is somewhat respectable and this will help you get a better job when you return.
While you may think you will be too old to travel, you aren't or won't be and travel will always be there.
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