My husband is at risk. We are now caring for his mother. She has her good and not so good days. I'll tell you though, I don't regret being with him, even if it means that I'll be caring for HIM one day.
Many many people end up being caregivers for a spouse who gets ill.
I would never give up the happiness we have together now just to avoid what will come down the road. Being a caregiver is exhausting and emotionally draining, but also rewarding and fulfilling. You do what you need to do. Everyone knows how much they are capable of handling. Better to be upfront now, than to ruin a family years down the road.