I don't know about that. Much of the vocabulary of English was added for reasons of fashion, not necessity. We didn't need the word pork—swine worked perfectly well. But the nobility spoke French, and people like to sound like nobility. The French and Latin loanwords in English never filled a gap that English couldn't have filled itself.
Edit: D'oh! Curse your mind-reading and fast fingers, Porter!
I still disagree with that, saxon. The Normans learned French when they migrated from Scandinavia to France. They could've just as easily learned English when they came to England.