They've been doing Endurance-esque videos for awhile now. It wasn't that long ago that Brad's run of Demon's Souls ended. We'll get another one when another game one of them feels like playing on stream from start to end pops back up again.
Also, this is another reason why I'm okay with there not being a new ER.
It's funny you mention this as I'm currently rewatching the DP endurance run watching both Brad and Ryan, and Jeff and Vinny's back to back. To answer your question; yes, but I also thought Chrono Trigger was a bad game for the last ER so maybe it is for the best they aren't doing another one.