You can thank Christopher Nolan.
Perhaps not the way you’re thinking. Tom Hardy won’t be playing a “realistic” Jason any time soon, nor will Kenny need your permission to die. Rather, in order to secure co-funding from Paramount on Nolan’s upcoming sci-fi epic Interstellar, WB gave up its revenue rights to future Friday the 13th – some of which had been owned by New Line – and South Park sequels (Comedy Central was formed from two pre-existing channels, including a Time-Warner one).
BUT…this only holds for five years. So if I were Paramount, I’d be hard at work developing both right now.
I have little doubt that’s exactly what they’re doing.