Earth and the Solar System were not the same place after the Mirondian visit. The social unrest caused by Mirondian products, technologies and Blip! lasted for over fifty years after the departure.
But, the biggest difference was mankind now had the tool for star travel! Humans had done most of the "back work" building the Mirondian starship, and they could do it again, if they had the will.
And whether or not to have "the will" was one of the topics argued hard about during the fifty years of unrest. There were a lot of people dead-set against it. There were attempts to sabotage the starship-making infrastructure. There were attempts to cannibalize it to make other things.
But, in the end, it was decided that the Solar System was such a much better place that, "Yes!", mankind should follow its dream.
In 2500, a new starship was dedicated.
-- The End --