According to the Washington Post, drywall that has suffered water damage should be replaced to avoid collapse. In addition to being susceptible to collapse, wet drywall can also attract harmful mold spores.
The Washington Post explains that replacing drywall that has been water damaged is not all that difficult but should be done quickly to avoid damage or exposure to mold. Homeowners can determine whether drywall has been exposed to water by examining the drywall for a bubble or slight droop. Although leaving water-damaged drywall may be tempting, it can eventually lead to structural damage or toxic exposure to mold.