Nolan said there will be plans announced next week in order to give more opportunities to minnows between tournaments.
"If we expect teams to turn up only every four years we will not see change," she said.
"We have seen where opportunities exist, teams can make changes and improvements quickly."
South Africa, the lowest-ranked side remaining at number 12 in the world, face perennial champions New Zealand in the quarter-finals.
England, the top-ranked team and tournament favourites, face a Scotland side wracked by contract disputes and an uncertain future.
"Even at stadiums where we have seen teams scoring their 10th or 11th try, no-one is leaving," Nolan said. "No-one ever says there are too many tries.
"Avid fans might want more arm wrestles, but I want a bit of everything."
More than 245,000 fans attended the group games.