If you are unfortunate enough to have your wool blanket receive moth damage or moth holes then there are methods on getting the wool blanket repaired but they might not be completely practical.
You can have the wool blanket reweaved but the process is not that common and can be pricey. Since reweaving is sort of a lost art form it may be difficult to find someone who can do this for you.
The practice of reweaving means that any damaged are will have to be replaced by the missing material which would usually be yarn. The yarn would be reweaved into the missing parts of the blankets, so if the blanket is highly detailed or an common style or color this might not work as well.
Typically the only times you would spend the time and money on reweaving a moth damaged wool blanket would be if the wool blanket was very expensive or very treasured to you.
Remember that you can prevent moth damage and moth holes fairly easily by just taking some precautionary measures.