TU had a much longer sustained run of excellence than WSU has ever had. WSU may very well turn into a Gonzaga of the midwest. Or, they could have caught lightning in a bottle with Early, VanVleet and Baker and when all those guys are gone they may take a significant step back. I would make them sustain it through more than one generation of talent before the conference commits to them.
Not sure how you calculate your position. Granted, WSU's worse years were during the period of time from mid-80s to 2005 during the NCAA tournament participant expansion when a lot of schools have experienced the bulk of their invitations. However, according to AP polls and NCAA tournament results, WSU has had an overall run of excellence exceeding that of the Univ of Tulsa in nearly all measurable metrics.
http://www.sports-reference.com/cbb/schools/tulsa/polls.html
http://www.sports-reference.com/cbb/schools/wichita-state/polls.html