If they are going to have just the One Title now then they need to do some serious investment in the US and Intercon title. The tag division is getting there and the last thing it needs is to be dilluted by big names being paired together to get on the card.
I doubt Punk-Bryan will be involved in the tag division picture, but it wouldn't be the first time something like that happened I suppose. I imagine they'll be tied down with Bray Wyatt et al.
Really hard to get excited about Orton-Cena unified title match.