If you will read earlier post, it is explained that he was slowly dying and fading away and why, and because of this, 2015 isn't altered because he altered the timeline where he doesn't live in the year 2015, therefore having no affect on it, no visible affect anyway. Im sure his family and other little things like that are affected by his death and his grandsons, if he has one since he died, doesn't have him around anymore to wax and buff his car and stuff like that.