Because I've set the scenario 1 year after the liberation, the approach of the anniversary causing the wyter to "wake up", I have assumed that over the year any other Seven Mothers cultists have left Jonstown (or died) because it's just not a good place to live any more. The dwindling congregation must have an effect on the wyter, indeed I assume it has contributed to its madness. The way things are going, the remaining few Seven Mothers worshippers are going to leave for points north in my campaign. The departure of the last remaining congregants will probably solve the problem as the wyter will wither and presumably dissipate or return to the spirit world. The loss of the congregation is a weak point for setting the story a year after the liberation: of course, as the wyter is "mad" it may not behave as a normal wyter would - that's my excuse.