I'm no expert either, but I tend to agree with you, that's why I am leaning toward the 3TB Fusion. I guess I could go with the 1TB Fusion + non-SSD externals just to protect against the Bootcamp issue, but I have a feeling that Apple is going to fix the situation so that Bootcamp works on the 3TB (at least that's what I'm trying to tell myself!).
Well I went with the 1TB fusion because of what people on here told me about it being just as fast and keeping your internal drive healthy to store your photos/video on an external drive and just use the internal for running the program/application. That was I suppose more for video editing but I don't regret my decision to order a 1TB fusion instead of the 3TB I had initially intended.