Ubers is just a banlist, so an intermediate tier is highly unlikely. However, UU is a completely different case. As it stands now, it has been divided into "High UU" and "Low UU" with certain pokemon in HUU ultimately getting the ban into BL, which hinders the game, as they are deemed too good to stay in their tier, yet without good reason to be frequently used in the above tier, being doomed to be seldom seen in competitive play. The issue is not about their general abilities, but the players' tendancy not to explore the BL or lower tiers for pokemon to be used in OU. The best example is Klefki which was in BL from the start of XY till now that some people started experimenting with it enough to bring it to 3.41% usage and up to OU. Now you see it in every third team, so it wasn't really that bad. However, not any pokemon can be given the same treatment, and usually the ones that receive bans after suspect tests are the ones people tend to forget.
So, goodbye Salamence from competitive play. OU is not your place, since stronger beasts can perform better in your every role, but in UU (or better said.... Low UU) they can't cope with your unpredictability. While the same cannot be said about Zam, because it's a beast for any tier, other mons like M-Houndoom, Kingdra, Togekiss and Victini are already forgotten in the eyes of the players, because of the graveyard called BL and BL2. Unless Smogon tries to divide the two into separate tiers to encourage the usage of more pokemon, I doubt they will see more usage in the near future. Let's hope Gen7 brings more gems to use and balance the lower tiers, because frankly speaking OU is where the most plays are made, hence the most balanced tier both in archetypes/playstyles but also threatlists and synergy potential.