What is the future of South Park?

I just saw the new episode of South Park, "You're Getting Old". The ending left me questioning how much of a future South Park has left. Trey Parker and the other writers of South Park are masters of defying reality and fixing problems with unbelievable solutions, so I believe the situation can be fixed in the very next episode, however, there was no "To Be Continued" also there has already been talk about South Park ending on season 15, as well as some of the dialogue pointing to this being amongst the final episodes. My question is: will there be a season 16 of South Park? I also ask that you please include your source, because this there are many mixed answers for this already. Thank you!