I kept the file BlogView.aspx (and modified it) for backward compatibility, new posts will use /Blog/ViewPost.aspx in their friendly urls, but there is really no need to fix the urls for old posts unless you really want to delete the BlogView.aspx page. In that case you would have to edit the urls in url manager until they all work pointing to the new page, then you could delete BlogView.aspx, but its included in my packages so it will come back in future versions.
Pages that could be deleted without breaking backward compatibility have already been removed from svn and from release packages.
Best,
Joe