Well, I think anonymous results are never the best approach when conducting surveys. There is a quantitative aspect and a qualitative aspect, and they both resonate in a certain way. That said, numerous studies, reports and more qualitative surveys provide an insight into the state of businesses and organizations.
Anonymous online surveys have some value, but I think an appropriate balance is required as well as weighing all considerations from your committee. A number of actions have already been taken. All the elements can then be weighed to get the big picture.