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No matter whether it's hibernation technology or realistic robots, both are already mature technologies.
Even the dozen specialized artificial proteins required for hibernation technology have been handled by Lincoln in his spare time, and conditions for controlled deep sleep and safe awakening, previously unattainable, are now in place.
Only the final step of empirical verification was left, and Lincoln couldn't be bothered to run it.
Not to mention realistic robots, he and Little Princess had even flown to the other side of Earth to play around.
"Most passengers enter a state of hibernation, with some staff members taking control of robots to oversee the spaceship, complemented by virtual world entertainment, to pass the long interstellar travel time."
In theory, this posed no problems.