I think either Darren or Christopher could have been a possibility, but then I don't know as I wasn't expecting Megan to leave last Friday!
I don't think it's a popularity competition anymore, it's more to do with who follows whichever reality TV celebrity with more fervour than the others. Geordie Shore's very popular with the young and mindless, as is TOWIE, I think the likelihood of one of those two housemates leaving is unlikely, Tiffany seems incredibly popular.
John could leave perhaps, although I hope not, but he possibly doesn't have such an avid, frenzied following.