I think the focus on a disembodied soul is also related to the difficulties inherent in making sense of continuity of self from the current body to the resurrected body. It's like a premodern Star Trek problem: if I go into the transporter, get dematerialized and then rematerialized elsewhere, am I still me? Christian revelation of course says, "Yes, you are," but that leads to the question of how that can be the case. Enter the immaterial soul.
I don't know how that turned into people completely disregarding the resurrection of the body, though. That said, it's possible to simultaneously adhere to a general resurrection without caring too much about the Second Coming. Not completely orthodox, but I like John Polkinghorne's quantum take on it, where a cosmos made new might entail an entirely parallel universe. Obviously the laws of physics would need a complete overhaul for our own universe to be transfigured in the necessary way. Maybe it will be, or maybe it's already happened elsewhere. Who knows?