Slasher films were an inexpensive formula for exploitation flicks, the expensive ones came later and the really pricey ones were cashing in on nostalgia.

Found footage has gone through a similar arc.

We had The Last Broadcast and Blair Witch, then more expensive flurries with Cloverfield, Chronicle and Apollo 18, we have had the odd surprise like REC, Troll Hunter and Grave Encounters but once people get officially bored enough to no longer justify the Paranormal Activity sequels the subgenre will lay dormant for a while until those films are old enough to feel nostalgia for.

Haute Tension proved that the slasher formula can be scary.

Alien is basically a slasher film for it's second half so maybe all it takes is for someone to find a successful gimmick to move the formula out of the nutter in a mask killing vulnerable women safety zone.