In Germany these titles still exist as part of the persons surname. Only in Austria they are forbidden (but still used anyway). The diplomatic form has always been to use titles after the first name, so the present practice isn't all that peculiar. Restoration of monarchies in Germany on a state basis? King of Bavaria, Grand Duke of Hesse etc. I think it would be great but it's not going to happen. It's gone and will not return.
Thank you for your answer. I fully agree that it is not going to happen but I was wondering whether, other than Bavaria, there are any parts of Germany where monarchist sentiment for the 'local' royal house exists, not as a political 'movement' necessarily.