According to Collingwood the mark of the historian and the purpose therein is to relive past events in order to spin out the why of stories. History inevitably ends with the present, not the future, but for history to have value, it must discover why past events happened the way they did, be it from socio-economic trends or from reliving military campaigns from the point of view of the general.
The next advancement in Macedonian history will come in one of two places. The first being the fore bearers of Philip and Alexander, bringing to life the institutions so poorly understood in the time of Philip and Alexander. The second, and more probable,* place will be in the study of the Macedonian hierarchy under Philip and Alexander.
Each new work on Alexander brings in a new perspective because each is by a historian** with a different set of experiences, but most are not really saying anything new. Many of these books simply rehash other arguments and arrange the information in new ways. When they do say something new, it is often touching upon absurd, such as investigatory evaluation of suspects for Alexander’s murder.
In short, what has been brought to life about Alexander has reached the limit of usefulness. Of course this will not stop people from writing about Alexander, but new works are less useful than one might think.
Each of the two topics for advancement round out the study of Alexander and Macedonia the way a new book about Alexander does not. For this field to advance, one or both needs to be seriously studied. Careful and convincing answers are needed.
*More probable simply because the focus of so much work in on Alexander. For some reason people find him interesting. Go figure.
**Though labeling some of the authors as historians would be generous at best.