This is from the National Review online today. All the facts are not in regarding Terri.
When the doctors told me my wife had six weeks to live, I starting investigating cryonics. I was shocked to discover just how credible their arguments were, especially those written by some of the world's leading neuro experts. I already knew nanotech will be able to repair cellular freezing damage within 50 years. What I didn't know was how important it was to begin the crygenics preservation before the brain was too damaged to preserve its neural links.
I loved my wife and didn't want to lose her. I then resolved to contact the Cryonics Institute and sign up my wife in the hopes she can be cured and revived in the future. Unfortunately, she passed away the night before I was going to call CI.
I felt horrible, not just of losing her, but also because of guilt and regret. If only I learned of cryonics a month before. If only I joined the Cryonics Institute a week before. Perhaps we would've been able to preserve her before her brain's connections broke down.
Since then, my entire outlook on the right-to-die has changed. While not supporting it strictly, I do support cryonic preservation before the brain's connections have been irreversably damaged.
My rationale is preserving the person and his personality is more important than extending life as long as possible.
By way of analogy, would anyone want to undergo a procedure that will extend one's life by 20 years but will have that 20 years as a mindless invalid? I doubt anyone will.
Cryonics hold the hope of revival in the future. If I ever suffer a brain-wasting disease such as Alzheimer's; I want the option while still cognitive of getting cryogenically frozen before my brain is irretrivably destroyed.
If we can chose to be buried or cremated, we should also have the option of getting frozen. After all, if cryonic revival in the future is impossible; no harm done - we'll be just as dead as if we were buried or cremated. However, if we're right; we will be restored to health sometime in the future.