Take out a bunch of the most expensive club seats that generate a larger percentage NHRR for owners than cheaper seats because soccer.
Barclay's has a standing room that looks out from the concourse level behind some seats but don't know if it's open with the hockey configuration.
MSG has bar stool seating.
Roger's Place is supposed to have something similar.
Quebec has cool open concourses. You'll notice the absence of tunnels needed to get to seats and ticket holders are able to see inside the arena from everywhere on the concourse.
Any innovative seating changes will no doubt carry a premium and identified as a club of some sort. It allows owners to capture a higher percentage of revenue.
Football though... There's patio style seating examples in Winnipeg, Hamilton and the new one in Saskatchewan.
Tim Hortons Field