I am sure there will be some kind of revolution. Remember when MM saw the baby blanket? She seemed to have a look of remembeence and her voice changed slightly. David has yet to see the blanket or anything related to Emma (object wise) from the past.
Also I don’t think he had paid much attention to the ring on Mary Margret’s finger. All objects seem to spark some memories, we just haven’t seen the one to jog both Mary’s and David’s.
Perhaps they all need to be around the object at the sane time.