This seems more like something that would fit into a movie's plot. But why would Sanpei and his brother be their servants? That seems a little far-fetched 0_o
Idk, Ash represents young children, and his obliviousness is a sign of that. That's why romance in Pokémon will likely never be something more that subtle. But who knows what will happen by the end of the current series. If anything, I imagine Bonnie would try and get the girl to marry Clemont.
I can see Alain appearing in the main anime with Ash to defeat Team Flare, but I don't see an anime-exclusive Team making an appearance.