Just because most of their plans up to that point (some failures along the way) worked wonders, doesn't mean that a sane government and some sane generals (can't remember who, read about it somewhere) can't outright refuse to invade Anatolia and just content themselves to Eastern Thrace, few islands in the Aegan etc. Maybe some sane generals convince the government of the day that an invasion and annexation of some of Anatolia isn't worth it and they realise their could be big problems in even trying it and they content themselves with Eastern Thrace, as their were some generals against it because of this.