Danny,
Judaism teaches it was ALWAYS God plan for Adam and Eve to eat. Where they screwed up was in eating of it too soon - before the sabbath, before they were properly prepared.
Judaism also teaches the eating of it was akin to an evolution, it turned them from 'animals' who operated on instinct alone to human beings who could think logically, emotionally, etc. - more or less what we are today.
I agree, they were always going to be fruitful and multiply, that was always the plan.