I don't keep bundles of Cash, Checks, and Credit Card receipts in my Router. I'm somewhat surprised that you do.
So you say changing resolvers in your router would do you no harm?
It was funny in Thailand - 2 major ADSL internet providers, with most adsl modems/routers configured with 3 default admin passwords - 3bb, tot, and, you guessed it, admin. By default they were all open from WAN - I checked once, just opened in browser a few IP's in a same subnet with mine - could login to about 5 out of about 10 IP's tested. About a year ago probably somebody exploited this, so what did providers do? Simple solution - just drop all incoming connections, anyway nobody noticed.