As a wills and trusts lawyer specializing in estate planning I can confirm that there are many reasons folks have not completed their plan. Interestingly the number reason is the easiest one to fix--procrastination.
In the article below that road block is discussed further:
Top Enemy of Estate Planning Article
We all know about procrastination and we all know what it does: nothing. In my field of wills and trusts it has disastrous results. When you procrastinate about your estate plan you place at risk not just yourself but your entire family.
By not planning you have no protection against any risk. Not just the bad risks, death or total disability, but ANY risk. One of the most important reasons to do your will and estate plan is reduce or eliminate risk. Advantages of planning with urgency-planning NOW include:
Decide today that it is time to move from being unprepared to having yourself and your family protected.