Not convinced. Not even a little bit.
If the war has gone on until 1918, then Germany is as exhausted as everyone else. Unless there have been some dramatic changes, the blockade will still have happened, the Turnip Winter will still have happened, German losses will still have happened.
The Ottomans taking the Middle East is unlikely, to put it mildly. They have logistical difficulties beyond imagining to (fail to) hold on to what they had. The absolute best case scenario for them, given the logistical infrastructure, is holding on to what they have - which begs the question as to whether, with Turkification in full swing, they would want to. Expanding? I don't see it. The Armenians are screwed, obviously. The Arabs too, most likely.
Africa going to Germany? How would they hold it? Logistically, that would be a nightmare which even the German Staff could see was a nonsense.
If the war has gone on until 1918, then the first point is that everyone is exhausted. It really doesn't matter how you wrap up the getting there, that is an immutable point. If all sides are exhausted, then if Germany takes on colonies it can't support, then those colonies are either going to fall apart, or get the Herero treatment in short order.
Ireland will very much depend on what happens in 1916, and what has happened to Home Rule. It's one of those situations where the devil is in the details, and small changes can have a major impact.
India is another very complicated situation. India made an immense contribution to WWI, and I for one wouldn't like to predict the course of events without knowing what the situation was that got us to the start point.
I'll grant you that Austria-Hungary is a basket case waiting to fall apart, but how that gets resolved is again something that would depend on the way things have happened to get us to this point.