Now THAT is a blast from the past. I was in my mid-teens when this was built, and I went to the first (I think it was the first) concert held there: Thompson Twins, who had Orchestral Manoeuvres in the Dark (a.k.a. OMD) as an opening act.
https://www.thespec.com/entertainmen...-and-lows.html
It may very well look like that, though I bet they preserve the seating slabs. The surrounding structure may be peeled back though.
I recall the Spec having a photo of the seating bowl from a crane, before the roof went on. And another one when they had dug down for the lower level seating.
EDIT: I've seen a number of other acts there too... The Tragically Hip, U2, others. Plus numerous hockey games and other sporting events. We may not have gotten an NHL team from constructing this building, but for what was spent I think it's done VERY well. Hence my optimism about it being renovated and remaining a large facility.