it's too bad that currie thinks firing oscar would be admitting a mistake. i'd actually argue that currie made a good hire (oscar's 32-22 big 12 record, two ncaa tourney appearances and a league title was a decent three-year run by any objective measure, and i doubt hypothetical coach X would have done better).
but now ... the team is coming off a sub-.500 season. the best players aren't returning. the fan base doesn't like the coach. with the roster that returns, oddsmakers will likely list k-state as the second-worst big 12 team, and possibly the worst. that means a second straight non-ncaa tourney season, and a fan base that will likely stop supporting him entering the 2016-17 season (after what'll surely be a low attendance season next year).
firing oscar would mean buying him out, which comes at a cost. but if keeping oscar results in declining fan support, fewer ticket sales, less national exposure, etc., then it's easy to justify the price tag that comes with it. again, as others have said: if it's inevitable, you might as well just make it immediate. firing oscar is a +EV move in the long run, based on the info we have in front of us.
i know people hate currie, but he's done a lot of good for k-state, certainly with the facilities upgrades and fundraising. the athletic department is in much better shape now than it was prior to when he took over.
if he fired oscar tomorrow, the talking point wouldn't be, "currie screwed up by hiring oscar!"
more likely, he would be celebrated, and i think he'd win over the remaining doubters he currently has.