Monica's obsession with Diego is increasingly powerful and will remove any obstacles in her path. It sounds like a line from a Spanish telenovela (soap opera). I didnt watch the Emmys, but knowing Conan O'Brien's style of humor, I would guess he was being a goofy ham imitating the melodramatic style of such telenovelas.
In what season will Conan turn back into Shinichi?
We don't know when that will happen permanently, but we're guessing it will probably be at the end of the series. In a recent interview, Aoyama Gosho has said that he already knows what the end of Detective Conan will be, but does not have time to draw it yet, but it may be sooner than we thought! But, he has changed back in episodes 48-49, episodes 180-183, and episodes 521-523.
What happens in last Conan chapter?
if you mean the most recent, a new case just started with Kobayashi-sensei. if you mean the very last chapter, then who knows? it's not out yet.
Arnold Schwarzenegger