Ourand speculates that Parker's comments "hit a nerve" with ESPN, and pushed his pink slip through the final hurdle. This would make sense given the timeline, since ESPN likely wouldn't just suspend an employee only to turn around and fire him. There must have been a second trigger, and the only thing Parker has done since the suspension is not back down from his "cornball brother" comments.
Or not. Per Ourand:
Source: ESPN made the decision to end its relationship with Rob Parker before his ClickOn Detroit interview was published.