I don't want to burden my kids like that. If that was the only option, I'd make sure to have an "accident" before I reach the point where I can't take care of myself any more.
Having watched the disease developed up close, the problem is that there is a very good chance you'll never be aware that you can't take care of yourself or even that you are approaching that point.
Or just tell it like it is. http://deadatnoon.com/ As I watch my mother go from 'mild cognitive impairment' to dementia and now Alzheimer's, I think this is the path I want to take when it's time.