I think they'll make the deadline, albeit the first season in G1C will be akin to "beta testing": a new product that isn't ready for prime time, as a way to work out the kinks and finish the final coat. Lots of construction to be finished that likely won't until the end of the season, such as the hotel tower, remodeled mall (still a cliff where Mrs. Fields used to be), 700K revitalization and general parking/traffic flow. 2017-18 should see a lot of kinks worked out and a better pre-grame/post-game experience (either if you're leaving or staying).
Side note: those two support beams in the interior cam continue to bother me. It really looks like those will block views from most of the upper decks - you don't see this low of a dip in other new arenas. Did they cheap out on construction, or is it just the camera angle?