I've not got there yet (losing my beloved hounds over the years has been hard enough, so I do have some experience of how it feels). I would say that if I'm left, I will be totally on my own with no close family since my parents and only sibling are all dead. My personal circumstances will be dire too - I'll be unable to support my current life-style, such as it is. So what happens if I am the one left behind, I just can't think about. To be honest, as at least he'll be able to keep this home if I go first, I just hope it works out that way!
Once I see my current hounds through their life - my waiting 'for the end' may not involve me being patient.