Subtle changes are made all the time in college football, but it's the wholesale changes that really help separate the men from the boys. Sometimes you have to revolutionize your approach in order to improve your product.
See: recruiting, the expansion craze, offensive philosophies, offseason schedules, rejuvenation tactics away from the field and satellite camps.
You simply can't fight change. Doing so is foolish. That's one reason the SEC has been so successful during the past decade. Those eight national championships in 10 years didn't just materialize overnight. Careful planning and excellent business sense from league officials, universities and coaches have helped the SEC rise above the rest in college football.