As mentioned above, blight is a disease that impacts potatoes, tomatoes, and plants in the Solanaceae family. It is not recommended to grow any of these crops in areas that had blight for at least four years as the spores can live in the soil.
As part of a crop rotation plan, it is not troublesome to grow other crops in that soil the following year after potato blight. If you grew your potatoes in bags, containers, or buckets and there was evidence of blight, then that soil should not be reused anywhere in the garden and it is better to dispose of it.