McGonagall wasn't dreading the next generation of Potter and Weasley kids. She did, however, keep track of how many of them would be attending Hogwarts all at once so that she could start to plan out Gryffindor's genetic all-star Quidditch team.
There missing it though. Ron and hermoine is Harrys best friends, and harry had a thing for cho. So 3 out of the 4 were important to harry. The event was set up for harry to rescue all of them and secure the points like he did.