View your sites as online property. Have safeguards in place, just in case you pop your clogs unexpectedly. Pass your sites on to your nearest and dearest, so they can continue your work. Either that, or find a trusted confidante. (Maybe at DP we should make up a buddy-buddy system?) It doesn't have to be death that will put a stop to your sites. Imagine having to enter hospital at short notice for an extended stay. What would this do to your sites? Would any domains expire, are they on automatic renewal?
Not worried about it! Haunt all the fuckers who treated me like shit! Seriously, prolly just sitback and relax, not knowing I have to go into work will definately be a nice thing!
Get married have kids, and then grandkids, present your experience and business to them. As an alternative you can find a good hosting pay for 100 years in advance and your business will live a whole century.