Just Fargo yanking our chain.
Wasteland 2 was kickstarted as a Fallout successor, and since it wasn't received as well as he would've wanted, now he needs a reason to tap into those hopes again when Wasteland 3's turn comes (most likely next kickstarter). A "Van Buren" successor is just what he needs to string us along, so we're good and ready to give him our wallets.
He's monetizing our dreams.
False, Wasteland 2 never intended to be a Fallout Successor, it try to be a Wasteland 1 successor and it do it well.