I honestly think Fear Factor is okay for what it is. It's definitely overstayed it's welcome (almost 7 years now on-and-off..it debuted June 2005
) but I feel like it's a theme park crowd-pleaser and at least makes up for the low attraction count with the closing of Jaws, Jimmy Neutron, and the lack of other entertainment still to come. With the show currently #1 or #2 in its time slot, it at least earned some newfound relevance.
But I don't think you'll have to worry about it being around when WWOHP 2.0 opens, unless the show's revival continues to do really, really well.