Nah, apparently NBC was perfectly fine with World Series day games as long as they were on the weekend (in fact, Game 4 of the 1984 World Series started at 1:30pm ET in Detroit). What would have changed is instead of the Cubs having home field in the World Series, they would have instead played the middle 3 at Wrigley (Friday, Saturday, Sunday).
There was talk that if the Cubs made the playoffs again in 1985 that they would move the home games to St. Louis