I wasn't going to comment on this yesterday, I was too tired. But now I think I will and I'm going to provide a planner (in general) perspective.
A lot of Airports are realizing that financially, their success is with their land. They are leveraging expansion of runways and building on cargo capacity, beyond passenger capacity. Some airports (like Edmonton) really have a huge land base (like YHZ) and are doing parks like
this (in fact this article provides some details). If you look at the future build out for YEG, it's going to be HUGE.
My issue with this is the same as Waye's - you are building essentially another Dartmouth Common (with no residential component) in a place where the road network is not established for that. Look at Bayer's Lake Shopping Area - that road network is a mess and Washmill Lake hasn't helped that much. When peak shopping periods occur, this area (along with most big box stores) are a mess. So I would need to see a well thought out engineering program before I'd be willing to sign on board with it; but the big transportation issue for me is the likelihood of this being served by public transit which is ZERO. So this will be a hugely car oriented area - which isn't good at all.
The other planning issue for me Waye has brought up - the fact that DC was expected to be a success and it's doing okay. It begs the question are we getting the best use of land for our $? Since DC will have a residential component, it is not as bad - but this would never have a residential component because of noise issues from the airport (and federal airport overlays). I am also forced to ask the question - how many people who are 'in transit' through YHZ are going to venture to this place to shop and then jump back on a plane? Do we have layovers here that are 4+ hours that I wasn't aware of?
The bigger issue that this screams at is sprawl - pure and simple. I have no objection to the airport being an employment centre; in fact that is what It should be under the RP. But there is a difference between the airport being an employment centre (aviation, hotel/tourism and aviation related industries) and then adding a bunch of big box retail because they could.
It also begs the question of who is going to go to this? Are there that many shoppers in Elmsdale/Enfield that this would be warranted? This also begs the issue that planners have started debating about the future of such sites and how we 'deal with them' in the future. Some of you may have seen
this map (my future visioning and opportunities sites) and I have identified DC and Bayers Lake. One theory that has been put forward (by some planners) is to use the vast parking lots as test cases for new mixed use redevelopment - allowing the 'big box stores' to relocate in urban formats into mixed use buildings on these existing sites. Then demolishing the large format store and adding more mixed use - these are huge sites. If you look at Costco in BL, it could likely have a huge commercial podium around the two flanking streets and at least 3-4 towers. If we think of that as the 'future' reuse of these sites - what is the possibility that could occur at YHZ? Likely nil...