This article says two things to me:

1) You'd better plan for your wifi router to have auto-updating software.

2) You should expect to have to support your devices for years and years.  You can't just stop with updates when the next model comes out.  

http://news.cnet.com/8301-1009_3-57596851-83/wi-fi-routers-more-security-risks-than-ever/