Only team I can think of are the Usos. Or maybe they should make the title intergendered because of the diva tag teams they are forming up here lately. The Bellas, Melina/Gail, Eve/Tamina (not official, but you know), Maryse/Alicia... lol!
Nexus, Santlov, and Uso's are the only tag teams left. They need one or two more tag teams, if Evan Bourne isn't injured, he and Mark Henry will probably challenge Nexus next. Darren Young and Michael Tarver also may return and form Anti-Nexus tag team. Honestly, i doubt WWE will even bother to find another tag team challenger for Nexus.
Sadly which ever two mid card level wrestlers they scrape up and toss together will be done for not real reason and will lead to nothing more than a random title match and then two more will be tossed together yet again.
Tag team division has been dead for many years now, they wont do anything, they'll just keep Nexus tag champs for a while which makes them look awesome and then maybe at TLC or the next pay per view it'll be Nexus VS zak ryder and chris jericho ... they enjoy throwing Jericho into random tag teams. Well, whenever he returns i guess