I doubt it, but put me down for don't care.
Am I supposed to really believe that the show is going to walk away from this Cristian/Jessica setup that they tackily concocted, simply because her memory came flooding back? My prediction is that Jessica will find out that Brody boned Natalie and, despite her now knowing that she is not living in 1938, will lean on Cristian for comfort as she copes. From there, he (Cristian) will fall for the <snicker> 'sane' Jessica, and Layla will eventually be ass out. Then Jessica will probably wind up rejecting Cristian for Brody after he ultimately falls in love with her, and after Layla has had enough and walks away from him. In the end, Jessica will be reunited with Brody, to the utter destruction of Cristian and Layla's relationship.
This "engagement" is merely a plot point.