First, I find your assertion that supernatural occurrences may occur in a cyclical fashion FASCINATING. Many religious traditions including Buddhism and Wicca argue for a cyclical worldview.
Second, who is to say that miracles don't currently happen? Would a parent not view it as a miracle if their child responded to a cancer treatment in a better than expected fashion? Would an aboriginal tribe in the midst of a drought not view a rainstorm as a miracle? I think Hollywood has maybe distorted the expectations that some have as to what constitutes a supernatural encounter or event. If you're expecting feathery wings or a ghostly touch, then yes that tends to be a rarer occurrence in most, dare I say, first world cultures. On the other hand, if you view miracles as an extension of a desired outcome, one could argue that they are all around us.
Many people who have had near death experiences think that being alive is a miracle in itself. :angel2: