Bored

It seem's that all the movies coming out today are trilogy's...I wonder if they think that it has to be three to bee any good or the story can hold three straight films and still be good...Now I have no problems with this at all, i respect the movie makers because it can not be an easy job..So what I am getting at , now video games are cathing on to this trend..besides  Halo. I can already see this trilogy thing going to four then maybe even five..Does anyone else think that this trend will keep going or plummit to its death?