I don't think a turn would be that effective, the fans would still cheer for Jay or Mark as heels. I don't really see them being good, top heels either, but if one went to to SNS, it would work, but the heel brother would get lost in the shuffle. I don't have a problem with them having singles runs both as faces, because both of them don't really need to rely on each other for a good match. I wouldn't say that a singles run would hurt them, but it would give them a nice change of pace after wrestling everyone in tag matches.