Yes. It would appear that part of the reason we had 2 protected rivalries after PSU joined was to get Iowa-Wisconsin back every year (we rotated out the last time the conference expanded).
And if Delany is to be believed, the Iowa-Wisconsin rivalry being dropped dominated the most recent expansion/division talks.
If we go to 9 games, we will be granted a Wisconsin-Iowa rivalry game. Hell, I wouldn't be surprised that if we stick with 8 games, the Big Ten might consider adding a second protected rivalry and rotating out non-division games faster or something.
You really can't drop such a competitive, geographic rivalry.