The term "touring" in itself designates staying on roads or light trails. Why on earth do you want or need a 29'er mountain bike? Are you climbing Pike's Peak?
If you are planning on going around the world... #1) Get a different bike. #2) Get a good strong, sturdy trailer to carry tent, sleeping bag, cooking utensils, clothes, food, etc. Also get a strong road bike with a steel frame & low gears for climbing hills. Any bike in this category should accept both a front & rear rack to add more panniers to carry extra tires, tubes, first aid kit, cell phone, tools, etc.
Oh yeah...one more thing to take along. The American Express Card. You realize this jaunt of yours will run into thousands, if not hundreds of thousands of $$$.