Migration of neurons occurs primarily in utero and very early childhood, and as you might notice, during this time very few memories are formed. That's because

Migration of neurons occurs primarily in utero and very early childhood, and as you might notice, during this time very few memories are formed. That's because memories are built on those very synaptic connection you would need to rewire. Any cure that deals with reorganizing the brain could very well wipe out who they are. If it's even possible. And for that kind of technology we're talking at minimum centuries, not decades.