If the elements of Hamas, namely the promising of death to all Israelites from Palestinians disappeared, then relations would improve and yes the garbage would stop. But it would still be a process that takes time to build trust between the people.
I don’t agree with your analogy.
What I said was more along the line of, “America electing a black president is a major step to eliminating racism, and it wouldn’t happen overnight.” I’d point out that I’m just fixing your analogy, not that I am making that statement.
Part of the systematic change requires one side to not want the complete elimination of the other.