Wow, Dr. Egon Spengler I like the whole idea of multiple different universes in order to make every decision possible O.O...I personally believe that people could probably travel to the future if enough science was researched..However I don't believe travelling to the past is possible because whats done is done and I don't believe we can change that...
I would never though like to travel to the future because I'd rather wait tell it happens as opposed to knowing ahead of time and changing it if I didn't like it :]