Ya, 2 years my bad.
I can't imagine how hard this situation must be on Dave and all the people in his life. You raise a child and do your best to keep them safe and then something happens that changes everything. In Dave's case, he's left with a son who really isn't a son anymore, he's a shell.
I really hate to say this but it almost would have been better if they couldn't have revived Michael simply because the mourning process would have begun. Eventually you stop mourning and start moving on but in this case, Dave still mourns and may do so the rest of his days.
It's really tragic for everyone concerned and it's one of the reasons I've had my daughter read it. Kids really don't consider their mortality at all so doses of reality must be injected from time to time in hopes of raising their awareness.