Pre-planning is always a good idea; it gives you peace of mind and some certainty in the face of eventuality. Knowing that you can provide a nice and decent resting place for yourself or the loved ones makes any unexpected circumstances easier to cope with and is the kindest thing one can do for his/her family.
All decisions are not made in a hurry or under immediate stress and you have time to think things over.
Pre-planning make sense from financial standpoint. The cost of land and services is only going to increase over time, so planning ahead will ensure financial stability of the survivors.