Maybe make it a mini-series ( extendable ). There was a similar show Tera Nova that got canceled because the special effects costed too much. Netflix may worry about costs less with a 1 year (extendable) miniseries. The writers will not have to worry about running out story ideas. The writers can also plan on a finale ( The Marshalls getting home ), and maybe having 1-2 closure episodes after The Marshalls get home. When they get home they discover that they were returned the same day as they left. They still have most of their two week vacation to adjust to civilization again. They can be portrayed getting used to safety again, living in a house, processed food, having family meetings about feel freaky being back. Maybe one of them writes a diary of their trip that gets published as a sci-fi book. That helps them process what happened to them. It also makes them wealthy enough to explore/camp full time, which they are eager to do as they find contemporary suburban life a bit too confining.