Actually, I disagree. The concept of a generation ship requires a very large vessel , capable of supporting a breeding population of humans for thousands of years; all their food needs to be grown or manufactured on-board, and all their waste materials recycled. That implied a payload of millions of tonnes to be accelerated to interstellar speed.

At the other end of the scale the Starwisp is too small. It could barely carry a TV camera, let alone a human.

What is required is something in-between, a ship capable of delivering a sizable payload of manufacturing equipment to a system, which can then start making the requirements for a colony on arrival. No living people need be carried at all; they can be instead carried as zygotes, or gametes, or just as digitised DNA; human embryos could be raised to term in artificial wombs and raised by robots at the destination.

This might seem far fetched- but by the time we are able to manufacture starships, most or all of these other technologies will likely be available too. If they are, I would expect that no generation ships would ever be built.

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