What about Italy and Spain?Likely a decent chunk of what was once Austria-Hungary, althought I can see the Germans keeping the Austrians alive with the Hapsburgs still. Plus, the Ottomans- they were already on their last legs at this point, they were going to fall apart sometime that century. I honestly don't see the Germans becoming a Republic unless the Kaiser pulls some stupid shit, as they were in a fairly good position to continue (compared to the other states I've listed) without collapse.
Do you see the Ottomans expanding into the Arabian Peninsula in this scenario? As in, into the interior of this peninsula.I'm not sure if the Ottoman state is likely to fall apart without the extreme pressure of the World War. Tanzimât was well on its way and modernization efforts were progressing fairly successfully; it's largest problems will likely be the Public Debt Administration and European colonial pressure, but I'm not sure if it is likely to fall to revolution.