Obviously the weapon is a last resort, and if anyone has broken in and you are forced to use lethal force, multiple other systems have failed. I just don't see why I would want to limit myself based on one hypothetical scenario that someone on the Internet has decided is going to be the one he gets.
If someone wants to get into your house badly enough, nothing is going to stop them.
I'd also encourage you to research current crime trends. Over are the days of one guy breaking in and running when he hears the 12 gauge. Increasingly common are groups breaking in and going directly to the bedroom.