Do you foresee, that there will be a day in your future, when you will prefer to die on that day over living to see the next one?

Yes, I think that this is quite possible. However, the reasons are, as you say below ‘the weaknesses and diseases of old age’, so they're not really relevant.

I can also easily imagine that I will never want to die. I can easily imagine that, as health care improves ahead of my aging, many of the people who are alive now will live forever, and I will also. That would be fine.

But cryonics is different. Here, you are asking me to take a break of time during which technology advances far beyond what it is today, not to live into the future one day at a time. That does not interest me.

I'm not even interested in being revived from a coma after several years, using only contemporary technology. Certainly I don't consider it worth the expense. In fact, the main reason that I don't sign up for DNR now is that I know some people who would suffer if I did not at least outlive them (plus the bother of signing up, although at least it costs nothing).

But I think that your question may be a good one to ask other people who have come to terms with death and thereby find cryonics unappealing. Ask when, after a short or long period of apparent death, they would not want to be revived. For me, that time comes when the people that I care about are no longer around and the things that interest me are no longer current. But I can imagine that some other people would realise that the answer is never and decide to sign up.