Believe me I will be doing. My sons bless them are only 14 and 16 but they see what is going on. My 16 year old has said to me why do they not put her into a care home? I have discussed with them what I want. I will be making a "living will" so they can be clear about what I would want. I certainly do not want them going through this nightmare. Fortunately I do talk to my boys. My in laws have never been a family to talk.
Perhaps you should talk about it with your sons, assuming they are adults. Giving them your blessing to do the right thing in advance will allay much of the guilt they might otherwise feel should the need arise in future. I have already told my two that they are not to let me get into the state Grandma was in, regardless of what I might say further down the line.
Assemble the facts, even research CHs in advance, so that when the crisis comes, you, at least, are prepared. I had a look round the CH where MIL ended up months earlier without telling the rest of them, so when SIL said she'd been to see it whilst her mum was still in hospital, I was then able to offer assurances that it would have been my choice too.