The 1-3-1 was effective, but we have to keep in mind that Illinois hadn't seen it from Iowa, so it wasn't part of their game preparation.
Moving forward, you can bet opposing coaches will have a counter the second Iowa employs it. That's not to say it can't be effective, but you can't surprise teams with a new wrinkle all the time.
Personally, I really don't care what kind of zone we play. The key to any zone is activity, and way too often our players are a split-second too slow to react, be it feet or hand movement. We aren't athletic enough to overcome that.