One thing that I think is fun now that we have embryo freezing is that we can transport absolute masses of genetic diversity into the future, so even a small crew of a generation starship need not worry about interbreeding risk. Social risks abound, of course, but we could easily supply hundreds of thousands of embryos into the far future so that concerns of a minimum viable population are no longer valid.
That eliminates biology as a constraint. What a life for our descendants so consigned, generations to live and die on a ship so that their descendants in turn could one day revolve around a foreign sun. I'm sure at some nth generation they will resent us for sending them away from the happiness of Spaceship Earth.
It would be an amusing result if the only ones with the fortitude necessary to endure this are those religious enough in belief and purpose.
That eliminates biology as a constraint. What a life for our descendants so consigned, generations to live and die on a ship so that their descendants in turn could one day revolve around a foreign sun. I'm sure at some nth generation they will resent us for sending them away from the happiness of Spaceship Earth.
It would be an amusing result if the only ones with the fortitude necessary to endure this are those religious enough in belief and purpose.