Miller's World isn't actually (on the face of it) that bad an option. It has free water, a breathable atmosphere, organics compounds and hydrocarbons in abundance. You may also wish to note that the "star" that Miller orbits is in fact a gigantic black hole with a lifespan of *trillions* of years rather than the run-of-the-mill hydrogen/helium stars we're used to so the time dilation is rather less of a problem than you might think.

>  *“Look,” he said. “Dr. Mann’s data looks promising, but we won’t get
> there for months. Edmunds’ is even further. Miller hasn’t sent much,
> but **what she has sent is promising—water, organics.”***
>
><sub><sup>[Interstellar - Official Novelisation][1]</sub></sup>

and

> *“**Look at Miller’s world—hydrocarbons, organics,** yes.* 
>
><sub><sup>[Interstellar - Official Novelisation][1]</sub></sup>

It has everything, in fact, that's needed for ***Plan B*** to go into operation, regardless of the fact that the Earth would be dead and buried before even the first generation is of age.


  [1]: https://www.goodreads.com/book/show/21488063-interstellar