I would only watch if Jessica was in a few episodes. I assume she will have to be in one of the upcoming series, since we won't see a JJ season 2 until 2018...
Godga took a huge risk when she did the Sound of Music tribute at the Oscars and she pulled it off. She also staked her career when she sang the National Anthem at this year's Superbowl and it was revered to be as good as Whitney's. I have no doubt she's going to pull off an entertaining performance.