As mentioned above, a decision to homeschool or unschool or worldschool your kids for awhile doesn't have to be all or nothing. Even if it turns out homeschooling isn't for your family, a year or two away from the grind of the regular school system won't mean the end of the world for most kids.
As my wife, daughter and I slow travel around the world, we're actively looking for opportunities to be more engaged in the communities we visit. One way to do that is to enroll our daughter in local schools, which we've done twice, so far, for a month in Japan and now 2.5 months in Vietnam.
In Japan, since our daughter didn't speak any Japanese when we got there, I'm pretty sure she didn't learn a whole lot of science or history or geography, but she got to practice her times tables with the other kids (teacher let her do hers in English), and all the teachers totally went out of their way to help our daughter feel welcome during music and art and P.E.
Just about every day, for one or two periods, our daughter helped teach English to the 5th and 6th graders at her school in Japan. Although, sometimes it was probably stressful for her to be constantly surrounded by hundreds of people only speaking in Japanese, during English class she got to be the "expert." Everybody, including the teachers, looked to her, the little 8 year old girl, to teach them the proper pronunciation of English words and how to use them in a sentence. Although, it was hard for her sometimes, I'm pretty sure our daughter learned a lot from the one month she attended school in Japan, and I feel like the Japanese kids in the rural school where she went benefited as well.
In Vietnam the timing worked out just right so our daughter is getting to attend a full 2.5 month quarter at a little private English language international school where she's made a couple of good friends with whom she's been having sleepovers and going to the beach and out to eat and gotten to meet their extended families. Hopefully, even after we leave Vietnam, our daughter will continue to stay in contact with the close friends she's made here through Skype and email.
In a couple weeks, we're heading to Malaysia where we're planning to continue worldschooling for the summer months before traveling to Eastern Tibet in the fall, where we'll probably just keep allowing our daughter to learn by soaking up everything she experiences while traveling.
It's easy enough to go online and look up the US common core standards for each grade level, which we occasionally do, but we're not stressing out about forcing our daughter to learn everything by any externally imposed timeline. In case we decide to put her back into a public school if and when we return to the US, it'll be nice if she meets or exceeds those guidelines, but if there are any deficiencies in her knowledge of math or whatever other subjects, we can easily tutor her ourselves and help her to get back up to speed. Generally, our daughter is ahead in most subjects, though, so we're not really worried about it.