Potential Failure of USPS, Effects on ZIP Code Geolocation

In recent days the prospects of the economic failure of the US Postal Service has surfaced in the media.  The Postal Service, an idea that made sense to Ben Franklin in the days of the Pony Express, is threatened by financial collapse.  And if it goes, so does the integrity of the ZIP code system?

This impending failure is not really current news.  From years ago, there is this:
http://www.costar.com/News/Article/Outbound-Mail-USPS-Targets-Thousands-of-Branches-for-Closure/113889

Many of my applications depend on geolocation of the ZIP code.  No matter that this is a logical construct without sturdy underpinnings -- most people know their ZIP code and can enter it into a form.  Then we can use geolocation to find the nearest stores.  The answers, though imprecise, are good enough for our clients.

If you're the owner of an application that uses geolocation based on ZIP code, what are your ideas about best practices for us going forward?