Natural disturbance regimes are changing with the anthropogenic climate change. These modifications induce pressure on worldwide ecosystems. As a result, forest ecosystems are facing droughts and pest outbreaks, among other disturbances. We conducted three case studies in European forests to investigate the consequences of forest dieback on the habitats and resources as well as on the saproxylic beetle communities. We observe that forest dieback generated a large increase in deadwood amount. It also changed the profile of tree-related microhabitats, with an increase in fruiting bodies of saproxylic fungi in our three case studies. Furthermore, by promoting deadwood, forest dieback had positive effects on individual abundance and species richness of saproxylic beetles. We also showed in a case study that forest dieback had positive impact on the functional richness of saproxylic beetles, mainly at the landscape scale. However, the increase in deadwood, as a resource pulse, and the beneficial effects on saproxylic beetles may only be short to medium term. Moreover, species associated with declining habitats and resources due to forest dieback could be negatively affected. Therefore, major efforts to study ecosystems as a whole and over time must be made to better prepare for future changes.