The Autodoc was a nice sly way to create a possible sequel
I doubt it will get a sequel, but with the Autodoc machine, they left a very real possibility one of them survived. They could say that one of them died three years after the other and since they were alone, decided to hibernate in the Autodoc.
After the scene where the crew wakes up, it's possible you could see them find Chris Pratt or Jennifer Lawrence, who then have to figure out how to fix the ship again before it lands, or figure out how to survive on the new planet.
Also, there is the chance they could have found another Autodoc or like someone said, make a new one from parts.