To move the final battle against the evil sister to the end of the season could made me watch all the episodes...
I thought that too after I watched 2 episodes but now I think another way:
1) It would be too long (25 episodes) for them to learn how to defeat Princess Luna. What are they supposed to do for such a long time? This is not some battle/action cartoon - it is a kid show after all.
2) And do not forget about the Princess Luna - she will be back:
http://mlp.wikia.com/wiki/Nightmare_Moon#Current_StatusThe surprise party. One of those "oh shi-" moments similar to the ones you see on House all the time (House is loaded with those, isn't he?).
Haven`t watched many House episodes in English, but I don`t think it contains many such moments.
When season 2 comes out we can have Suuuuuuuuunday Sensaaaaaation!!!! for it.

When season 2 is planned to be aired?