Changing or forgetting the past..in the future?

Lola Rennt directed by Wim Wenders

Lola Rennt and The Butterfly Effect are just a few examples of films that are about changing or erasing the past in the present.
What if in the future we can erase, forget or change our past? What if we can go back in time, and make up for everything we have done wrong. Or change things, so we will be happier in the future? Or just forget completely what happened, who we are, and where we come from. Than we are able to start from scratch whenever we like. Would we or wouldn’t we?
Watch the Lola Rennt trailer that I posted above.
How realistic will this be in the future..Is it possible to make an interactive installation, to let someone experience the different stories of his or her past and the following outcomes and consequences? Or let a person experience how his or her life will look like by erasing or changing a experience? What is logic of certain people for things to have happened in a certain way on a certain occasion? What kind of decisions does a person make and based on and influenced by what?
However if we learn from the past, can we predict future decisions of people? And thus, future outcomes and results?
I WOULD LIKE TO KNOW.