I think sometimes (yeah a dangerous thing I know) and I've come up with a few things I'd like, no strike that, need to see in some main stream stories. Feel free to add thoughts and your own.
1: So we all know the whole prince and the pauper story. Prince thinks life is terrible and would be easier as a commoner, commoner thinks life would be easier as a prince, somehow they end up switching places and learn to appreciate their true place. I want to see a story that looks likes it is going to go that way, but when the princess decides it's too tough or awful to be a princess and they run away or whatever mishap gets them their 'freedom' and they learn the truth of 'real life' they don't get to go back. I want someone to make a conscious decision to go where the grass is greener and not only learn it not always is but they don't get to go back with a new appreciation for their old life. Sometimes we make choices in life, and there is no going back. We leave good things behind, but we gain other things in their place and not all gains and losses are equal.
2: A beauty and the beast story where the 'beauty' is lead to believe that the 'beast' is under a spell/curse, and they fall in love yaddah yaddah and at the end they are all surprised when the 'beast' doesn't transform and become beautiful. Then they get called out on it. The beast gets to tell them to shove it, and maybe 'beauty' learns that they aren't as beautiful as they thought, and either has to win 'beast' back, or 'beasts' finds someone else.
The reason I didn't use pronouns? Because ideally in my head I see the girl as the 'beast' in this story, but really the idea could go for with any genders for either character. M/F F/M F/F M/M
3. A love triangle that is solved by having a three way relationship.