Being the loving God that he is :)
How do you imagine this playing out. Let's say Eve didn't eat and so we didn't fall into sin.
What do you think God would have done with Satan and his demons?
As we know with poor Job. God let Satan have his way big time with him and allowed him to do many many things to him. So I think the same might be the case with Eve. Had it not been a snake, he may have come back in the form of another animal. Or tried another tactic altogether.
What do you think?