I'm going to go against the grain here a bit...
I don't think fruit and yoghurt is a terrible breakfast, for pre schoolers who can top up during the day..and the evening soup sounds lovely! I used to give mine a simple supper when little and it helped them sleep. Nor do I buy into the notion that cereal is essential... I think it's very much a cultural norm in the Uk, but other cultures and countries have very different breakfasts... One of the little ones in my class is Thai and would never eat a cereal or toast... she has chicken or pork every breakfast and always has rice for lunch!
I do think once they start school, a bit of protein matters.. it's a long time til lunch and school fruit won't do much for a child who has only had fruit sugars to burn off till then...children running low on energy food DO perform less well...many studies have shown that.
I have four children... two always needed breakfast , two gave up eating breakfast as soon as they could... but they made up for it at other times (and incidentally the two non eaters are two very high flying young people academically, so it obviously didn't hurt them there)
Nor is there anything wrong in avoiding crisps, junky food for as long as possible (ie school age) AS LONG as it doesn't become a mantra!
I think you are getting a lot of flack here not for the food itself but your feelings towards breakfast and it's place in the daily scheme of things. It's just food. Kids (mostly) and adults (mostly) need to eat first thing because they haven't for a good many hours. I genuinely thing that the only 'problem' here is that your own attitude towards what is, at the end of the day, just a meal , is for some reason, skewed and you really don't want to make ANY meal a big deal.
Why not try a small addition of protein to breakfast? Doesn't have to be a stinky egg ([grin), I get that.. hate the smell too and I'm not pregnant)... a small bit of cheese with apple is VERY nice, not offensive and just gives them a bit of something longer lasting!