Relevant to the conversation, the "expert" on this news story thinks that BC Place is in a terrible location. "sandwiched between highways", I don't think he even bothered Googling the site; the Dunsmuir and W Georgia viaducts he's probably referring to are no more than elevated streets from an unbuilt highway that could very well be demolished within the decade.
He seems to want the American style stadium in a field surrounded by parking for the "full experience... tailgating where the match is only one part of it" as if restaurants and bars within walking distance aren't part of the experience we're missing when we're only driving to and from the place.
He seems to also think getting 70k-80k people, again I don't think he Googled BC Place Stadium to see the actually capacity, out of the place is easier by car than, I don't know, a grid of streets leading patrons to two rapid transit lines, and again restaurants and bars where they can hang out to avoid the rush.
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The location of the Sens' Palladium has always been a major hurdle to convince fans to make the trek. There's no a single bar or restaurant within walking distance outside the actual arena. It's all parking, up to 500 meters away. You drive in, and then you drive out, taking 30-60 minutes just to get out of the parking lot. That's why we're so excited about the prospect of the new LeBreton arena, where transit will be 200-250 meters from the door, and it sounds it will be at least covered if not climate controlled. And if you want to avoid the rush, there will be bars and restaurants on site. For those more adventurous, they can walk to bar districts in Hull or Little Italy (on the street named for Lord Stanley of Preston), or take the train a few stops to Elgin or the ByWard Market.
With all that said, to reiterate my previous comment, a Halifax team is different if we're looking to attract fans from the rest of the Maritimes. There's a difference between an existing stadium and a new one. There's a difference between an arena with 150-200 event nights vs a stadium with 20 to 50. Ottawa's needs a convenient spot for the people of Ottawa and Gatineau, while the current spot is well off centre of the potential fan base. The Halifax stadium could be a bit outside the city to attract Maritimers from farther afield while still being near being near existing infra and transit, and add a bit of an entertainment district (which was the plan for the Palladium, but rejected by the Bob Rae Government), which can only work if it's supported outside event days as well (like Lansdowne in a dense downtown-adjacent neighbourhood).
I don't think the airport business park is a good spot, but it doesn't necessarily need to be downtown. A compromise can be found.