Before we got that Duke win, we had failed to make it to the NCAA 7 out the previous 8 years. Winning only two games in the previous season's NIT (over Boston University and Cal-State Fullerton) meant very little to anyone:
https://en.wikipedia.org/wiki/2005_National_Invitation_Tournament. I wouldn't consider wins over those two teams as being a strong run in the NIT.
When we beat Duke, it wasn't even half-way through the season and GT fans were still in a fairly bad place, even though we had hope with a new coach. Anyway, it gave fans a big boost and a big amount of confidence to the players. It helped the players for the rest of the season and in the tourney. If you beat Duke when they're ranked in the top 4, your confidence goes up.
I think your team is a lot better than its in-conference record shows. The record is in part because the league is super tough this year. Example - Marquette is only 4-7, and they're still considered to have a good chance to make the tourney. You've also lost close games. And you also lost your #2 scorer to injury.
I bet if you had your #2 scorer, you'd be even with Marquette in conference (and maybe ahead of them), and would be a bubble team, would get an NIT bid and do as well in it as GT did in the season just before we ascended. And quite possibly better, given that if you add up your point totals in three games against 3 top six teams, you were almost even with them. If you had your #2 scorer, you probably would have won the Xavier game: meaning two wins against top 6 teams.
Tonight I read an article on one of the major news sites that said the Duke win demonstrates the team is better than its conference record, and that you're closer to having a NCAA tourney team than your conference record indicates. Your recruiters can now say "We beat a top 4 team, we came very close to beating a top 6 team (Xavier) and we had a pretty close game against the #1 team that's been blowing out most teams. We lost a lot of close games in conference play, but with the addition of 1 or 2 more high quality players, we'd win those games and would be a tourney team, so please join us to make it happen.
I bet it will also be a morale booster to your players during this season, off-season and going into next year, and morale is very needed during your next eight months. The players are more likely to keep working hard in practices and during the off-season, knowing that they could make the tourney next year and make a run in it.
Next year you probably have your whole team coming back except Ahmed, which isn't much of a loss, and you have your #2 scorer coming back, plus a 4-star recruit, a 3-star recruit and a big man with potential. And all your existing players will have a year more experience, which matters a bunch in college hoops. Other teams will mostly be losing 1 or 2 key players.
I think you're reasonably close to where Georgetown was the year before we returned to the tourney. You won't have 2 NIT wins but you will have a huge win over a #4 team and close games against two other top 6 teams. If we had lost our #2 scorer that year, we wouldn't have even made it to the NIT. And we most likely wouldn't have beat a #4 Duke in that NIT year even with our #2 scorer.