納豆/Natto is definitely an acquired taste and I unfortunately can't stand the stuff.

I'm not sure if many families still go through the trouble of making/eating traditional Japanese breakfasts anymore due to the preparation times. I know that at the various Ryokans (旅館) it's definitely served but I think most Japanese families opt to eat simple and fast breakfasts like toast and jam, cereal, salad or ham and eggs maybe perhaps miso and rice.

Here's a survey that was done in 2000 that's related to breakfast in Japan:
Survey: Breakfast in Japan

For natto, you got to try it at least 3-4 times before you get use to it. It's like when someone (such as me) try green tea without sugar for the first time in Japan (I remember it's Itoen's):

"Hey, why this drink got so much leaves' smell!?" At first it's very difficult to swallow, but after 2-3 bottles, "wow I like it"

Just try it, it may be easier if you buy the one that include shoyu inside the package, I think shoyu make it easier to eat.