Where does that idea come from? Here's a picture of Austro-Hungarian troops in Jerusalem, thousands went there under German command to tdo precisely that - reinforce the Ottomans. Meanwhile the primary focus was elsewhere so it stayed at "thousands" and not "tens of thousands".
Unless A-H secures a separate peace - it's certainly possible as they're not part of the old Franco-German spat or British concerns about Belgium (officially) and German industrial might (inofficially), the Turkish front will be number 2 of the places where forces can be redirected to until victory or favorable negotiated peace settlement. Number 1 is the Western Front but there's only so many soldiers you can push into that small part of the world. Rail connection exists from Vienna all the way to Aleppo, logistics is a lot easier for them than for the British and French and unlike the Turks they can put up a fight thanks to having modern war materials.