I have a feeling there a quite a few people out there who want VSA but don't want NAV.

Numerous studies around the world confirm that ESC is highly effective in helping the driver maintain control of the car and saving lives and reducing the severity of crashes.[8] In the fall of 2004 in the U.S., the National Highway and Traffic Safety Administration confirmed the international studies, releasing results of a field study in the U.S. of ESC effectiveness. NHTSA concluded that ESC reduces crashes by 35%. Additionally, Sport utility vehicles (SUV's) with stability control are involved in 67% fewer accidents than SUVs without the system. The Insurance Institute for Highway Safety (IIHS) issued its own study in June 2006 showing that up to 10,000 fatal US crashes could be avoided annually if all vehicles were equipped with ESC[9] The IIHS study concluded that ESC reduces the likelihood of all fatal crashes by 43%, fatal single-vehicle crashes by 56%, and fatal single-vehicle rollovers by 77-80%.
ESC is described as the most important advance in auto safety since the seat belt by many experts.[10] including Nicole Nason,[11] Administrator of the NHTSA,[12] Jim Guest and David Champion[13] of Consumers Union[14] Max Mosley of the Fédération Internationale de l'Automobile (FIA), E-Safety Aware[15], Csaba Csere, editor of Car and Driver[16], and Bill Kozyra, CEO of Continental Automotive Systems[12] The European New Car Assessment Program (EuroNCAP) "strongly recommends" that people buy cars fitted with stability control.[17]
The IIHS and Consumer Reports are so impressed with ESC that vehicles cannot earn their Top Safety Pick ratings without ESC.