Top 68 at the very least would mean that if they were rated that high at the end of the season, they'd stand a reasonable chance at making the NIT. A team with an RPI in the 60s rarely makes the field (and I'm guessing never if you're not in a power conference), but stands a very good chance at the NIT at least.
For context, last year's NIT at-large teams had RPIs from 52 (Georgia) to 106 (Georgia Tech, the only triple-digit at-large selection). The lowest RPI for a non-major team was, depending on how you define "power", Richmond (80), Fresno State (76) or Valparaiso (71). The best RPI for a team that didn't get an NCAA or NIT bid was UNC Asheville (73) in the CIT. And only three eligible teams in the top 100 didn't get an NCAA/NIT bid. So a top 100 RPI
should result in an NIT bid, and a top 70 RPI is an almost guarantee.
This blog has ODU as an 8-seed in the NIT, playing Utah in the first round and the Temple-South Carolina winner in the second. But as Petey already pointed out, given that the 8s and 7s are almost always automatic bids, so ODU is effectively on the outside looking in. Other teams of interest: Middle Tennessee is the only other ODU foe in (3), while VCU, William & Mary, Towson, and UAB are on the others-considered list. WKU appears to be their pick to rep CUSA in the NCAAs.