I wouldn't worry too much about sameness - if they get bored they'll let you know and as long as he gets plenty of variety through the day it's not a problem.

I eat the same thing for brekky every single day for years...I'm a bit attached to it lol. I think brekky is a very "routine meal" for lots of people.

My DD has had weetbix for breakfast every day for 4 years. God FORBID there isn't any in the house she goes off her trolley!

DS is a bit pickier. Some days he just has boob. Other days he'll have 1 weetbix and some fruit (strawbs or banana). Other days he'll have toast and veg, or raisin toast. He seems to like a bit more variety.