I have previously seen the term "adaptive monitoring", although I do not remember where it comes from. Wetlands evolve. Consequently, the idea is also to monitor that evolution, with respect to invasive species, for example. Other threats are involved in this case.
As regards the inventory, I believe a lot of data have already been gathered over time. The focus now should be more on pooling all that information and checking that the protocols and definitions are the same. The focus will therefore mainly be standardization, pooling and communication. I believe that is more where efforts should be deployed. Many people are already developing inventories, but they are not communicating with each other. Things happen at various levels and so on.