It would have been okay with one, but i think the success of first movie is just too big for them to topple or match the record or even to somehow get a respectable gap.
I just hope this isn't cameron milking the cashcow cause this obviously looks one.
Movie 2: They meet yellow aliens. They fight. They make a truce. They live together.
Movie 3: They meet green aliens. They fight. They make a truce. They live together.
Movie 4: They meet red aliens. They fight. They make a truce. They live together.