1) There are an awful lot of relatively probable accidents that end with me dying in a hospital after a trip to the emergency room. I'd actually really like to see statistics on what percentage of people who die in each age group have their brains squished. 2) If you take FAI seriously, it may be worthwhile to attempt to preserve yourself regardless of what kind of shape you're in. I'm not certain a superinteligence could repair damage I can't even begin to imagine how to repair, but I'm not very confident it can't in many cases either.
In the past, the Cryonics Institute has had a policy that said that they would not accept anyone who is not a member. This has changed. The policy now is that someone who has full legal authority over your body can sign you up after you die. It costs $36,250 to be frozen if you are not signed up, which is more expensive. They also will not do anything until you have been on dry ice for 2 weeks after they have been contacted, so not being a member is more risky.
This is very important news for anyone who is currently cryocrastinating. It means that you can drastically increase your chances of survival without filling out any forms. All you have to do is tell a loved one you want to be frozen upon death, and that you would like them to take responsibility for making sure this happens. This takes literally 30 seconds. Do it now!
This news might also be a reason to not sign up right away, if you think something better (like radical life extension or uploading) will come along in your lifetime. We should discuss this in the comments.
Edit: The general consensus of this discussion is that this is a really bad reason not to sign up for cryonics.