I feel every mountain biker should have atleast 2 bikes; one HT and one full squishy. They each have their place.
That being said, I just agreed to sell my full suspension to a friend and it's replacement will be a full carbon hardtail that I'm going to make as light as humanly possible. Most of the trails I ride are hardpack single track. Problem is that if I leave that trail system I'm stuck with typical northeast trails littered with rocks the size of a babies head so another full suspension probably isn't too far off.
I don't know where I was going with this, just ride the best bike you can afford.