It's actually a good thought. For me I do believe more protein works best and keeps me satisfied longer; however, I don't worry near as much now if I'm eating a magic number in protein. I try to get at least 70 grams (for no other reason than I want to) and I do try to eat more veggies and fruit.
I don't seem to eat much fruit though, although I like it it's usually my last choice after protein and veggies (which I love pretty much any veggie) and the space available for fruit just isn't there.
Like Kim said, I believe the 100 grams of protein is basically the thought that it's dense and will keep you full longer so you don't have room for excessive snacking or grazing.