From a conference perspective, the SEC doesn't look at last 10-15 years but all-time potential. Sure, Tennessee has struggled (along with Texas who is on the list) but both would be seen as top 10 all-time programs by the SEC and would be treated as tier 1.
Take the 2015 and 2016 teams. They were loaded with talent which shows that:
1. Tennessee still can recruit
2. Tennessee is still a brand name
3. Tennessee can still win at a high level
Take Butch Jones and put even average coaches like Gus Malzahn or Sam Pittman at the helm and those Tennessee teams likely win the East and make playoffs.
Georgia got lucky with Kirby Smart. Say they had hired Pruitt, you guys would be in the same boat as Tennessee right now.