Yes, and it is going to answer some of the questions that have been asked.
I think that we must not be naive: standard research surveys have response rates of around 30%. If you use electronic forms, the mail and so on, the response rate for all those surveys is roughly 30%. In fact, it is usually lower than 30%.
If you want accurate data, you have to have a sufficient number of respondents participating. We must not be naive. We are talking about people being available in the course of their everyday lives. This has nothing to do with their patriotism. We are talking about normal activities in a normal life. In a normal life, if someone has a whole slew of things to do in a day and this voluntary thing is added into the mix, then without a doubt it is the thing that person is not going to do. This means that the data are no longer going to be reliable. It is very simple. We should not delude ourselves into thinking that, if we explain things to people, they are going to be more willing to fill out the questionnaire. That is not how things work. But we do need to help people who have language problems, such as people who are illiterate. People who have difficulty filling out the questionnaire need to be able to get help. Generally, though, it would be a mistake to think that a completely voluntary questionnaire would have a satisfactory response rate. That is not true. The response rate would be around 30%, and we would clearly not meet our objectives.
Lastly, it is not so much the amount of information as the accuracy of that information that is the problem. Would some services be lost? The same services might exist, but they would not necessarily be tailored to people's needs. Accurate policies require accurate information. The higher the participation rate, the more accurate the data. It is as simple as that. It is simple math.