That's a good question. I think the phrase "I will want to have" anticipates a very strong predictive correlation of a future state which is unlikely. There are probably correct circumstances for using it -- for example, imagine loving an internationally renowned pizza place in Chicago where everyone orders their deep dish sausage pizza, it wouldn't be wrong to say, "Oh yeah, when we get there I will definitely want to have ..."
But much more common for the future tense, you'd probably more likely say "I
may want to have"... the idea being that you won't be 100% sure of your future state of mind and desire until you actually get there.
Must have hired a few Americans at the BBC.