My DS2 went off weetbix too at about the same age. He liked Sultana Bran (still does) and sometimes Cheerios. He will eat them before we get up without milk and then have with milk for breakfast.
Otherwise a smoothie of some sort..this could be something you have made the night before if you struggle with time in the morning.
DS2 loves Banana's, another filling thing that can be eaten on the run.