Personally, I don't understand why the city would want to replace the Metro Centre. It's a good sized facility (10,000 seats) in the centre of downtown and is a boon to the neighbouring restaurant and hotel district. It is plenty large enough for the Mooseheads, the annual tattoo and most concerts and special events. It perhaps need to be refurbished, not replaced.
The Moncton Coliseum on the other hand
needs to be replaced. There are structural issues with the current facility and we want to build downtown to replicate the sort of effect that the Metro centre has on
your downtown core. You guys already have a good thing going.
I think Halifax would get far more bang for the buck by building a football stadium instead......this would tend to complement the Metro Centre.