Oh, wait. That first sentence came out wrong. What I meant was 'something that almost certainly won't affect you or anyone you know during your time here in World of Warcraft'.
Because in order for there to be bluewalling, there not only needs to be someone running around flagged for PvP somewhere other than in a capital city but there also must be someone who enjoys world PvP in the exact same spot.
*She looks off-camera* Why are we talking about this again?
Bluewalling was once frowned upon and considered dishonorable or a breach of etiquette at the very least. Now, however, it's likely that anyone who is running around flagged would be more than delighted to get any form of world PvP whether they are able to get the first blow or not. And in any case, it was always still a little more polite than being a rogue... because at least they could see you coming.
***The more you know***