"18 Scorpii, sits about 47.5 light-years away "
Practically next door in galactic terms. Any word yet on planets? Even the presence of gas giants like Jupiter could signal a similar solar system structure to ours.
A "Generation Ship" could be there in say, three hundred to five hundred years which really would not be that long a time to start a human presence in a new solar system
You can bet there will be a lot of planet hunters checking out the wobbles in that star. One would have to think that something so similar to our own would have to have a much similar initial environment.
Just think. If there were an Earth-like planet around it, we could be taking pictures of its continents within the next 20 years.