There’s no reason to think WTNV is ending.
The writers have never indicated that they want to end it anytime soon. I’m pretty sure they’d tell us.
Off the top of my head, here’s a quote from Meg Bashwiner (proverb lady, Deb) from a recent interview:
She thinks the Night Vale train will keep rolling.
“I think the soil is so fertile with ideas,” Bashwiner said. “Joseph and [co-creator] Jeffrey Cranor are really creative storytellers and in the world of the supernatural, there are less limits you can put on things. Something that is true one day can be false another day and it will still work in the show.”
Meg is going to marry Joseph Fink soon, so if he had any plans to quit, she’d probably be the first to know.
Let’s all just relax and trust that Finknor is just fucking with us, like always.