Then you will run into "I didn't get the letter" or "My Mom was sick/dying/going through treatments/whatever else and I couldn't do it!!" Also, then who owns the property when it is taken away? The county again. Or city, or state. They sell it, make money. Give an inch... they'll take a mile. Eventually the government entity that is able to take property if no one claims it will change their rules and slowly weasel their way into getting the property easier, quicker, and with choosing which property they get.
I just don't know how to do it without weasly people eventually manipulating the system.