The 34,500 capacity stadium was a sellout in the tournament's heyday.
Stand-in national sevens coach Scott Waldrom spoke out during the tournament, telling Newstalk ZB's Tony Veitch he couldn't believe how small the event had become.
"It was really disappointing, especially to see the drop of numbers from game two and game three," Waldrom said.
"I guess if we're aiming at a family environment, at 9.30pm kids probably want to start getting home and the parents leave. It just didn't feel the same and that's a real disappointment because I grew up loving the Wellington Sevens and it was the highlight of the year being a Wellington boy."
"To see it now is mind-boggling...to understand how it's declined so rapidly. There's certainly going to be a lot of hard questions after this and I'm sure World Rugby will be asking 'what's the plan going forward'.
"It's really sad. A lot of people are complaining about it and saying it used to be fun but I just don't understand what's really happening."
Tournament organiser Steve Dunbar remains positive, as he had been before the tournament when low ticket sales were already being reported.
"We had to make a decision after the 2014 tournament, going back in time is not an option for us," Dunbar said.
"For the tournament to move forward, it needs to change. We know the 20,000 people over the two days had a really good time, and that's a good thing.
"The atmosphere was not at the height of five or ten years ago but it was still good all the same."