Maybe they should be a little more discerning about their offers, then.
In an ideal world yes. But recruiting kids today, the process starts during their junior year and a coaching staff pretty much has to offer a kid a scholarship if there is mutual interest.
It is a bit odd ISU would spend so much time watching Wright and then pull his scholarship at this point. As others have posted, the coaching staff must already have or are confident they will get a committment from a PG they value more.