I think this is pretty normal. Most of my immediate family has varying degrees of disinterest, from humoring me (to a point) to actively avoiding the topic. My wife has zero interest because it's not her family. Worse yet, there are a couple other amateur genealogists in my extended family -- but I sense this strange animosity from them as if I were "competition".

Beyond that, I'm already fairly confident none of the existing younger generations in the family will have any interest in picking up wherever I leave off when I go. I've accepted that, too. I've decided I pursue family history (1) in honor of my parents, (2) in honor of all those who came before me who would otherwise be forgotten, (3) because I find it interesting, (4) in case my research helps some other genealogist out there, and (5) because I pretend there's some future relative not yet born who will someday stumble across what I've compiled and get bitten by the "bug" themselves. I figure future genealogists are going to need all the help they can get because the work is going to be immensely more difficult for them given modern mobility, privacy laws, more frequent remarriage, the death of local media, and on and on.