Hi,
I too am really frustrated with this change and came across your post when trying to find an answer.
The only workaround I have managed to find for this removed feature is to create a ‘station’ for the individual podcast in question. I had a couple of stations already setup when I updated to iOS 11 where I’d add podcasts of a similar theme e.g. Soccer or technology and realised that the station settings allow you to choose the playing orders (see screenshot). You can then choose to play oldest to newest and they continue onto the next episode. This is a workaround and not a real fix but hope it helps.
