I'm hopeful that it won't be that bad. If things go well, I can understand a small conspiracy to kill him and his family that was botched in that he didn't die. Further that the two realities are an unexpected outcome.
I'm hoping for a realistic explanation, though, which may be stretching things. For instance, what if he is in a coma, and everything thats going on in his head is his attempt to investigate the crash. What if some little thing from each episode pieces together to tell him what really happened in the real world, where he's now in a coma envisioning these two alternate worlds trying to piece tiny, tiny details together and figure out the crash merely from knowledge he already has, but may not have noticed or considered.
He eventually figures it out and really wakes up... Is his family alive? Is he alive? Is the real world better or worse than his dream worlds? Does he get enough clues to solve the case without further investigation?
While I love science fiction, if they go the route of parallel universes where he's somehow traveling back and forth mentally it would actually be disappointing.