There's so many ways to skin this cat, it's good to hear everything is in the table for review. Who'd have thought a brand new stadium would be bandied about? Assuming Cajun Field remains, then I'd advocate for the following:
1. Year One- Build an east upper deck with suites, club seating, room to expand as needed. Leave as much of the NEZ greenery in place, but monetize the remaining area with patio seating and/or corporate patio seating, bars/restaurants where maybe sell 2,000 tickets in that area.
2. Year Two- Tear down the existing west upper deck, rebuild with suites, club seating plus the press box, room to expand general admission seating if needed.
Stadium capacity might be about the same as now, but opportunities for enhancing the fan experience should be greater. There's a lot of folks these days who prefer not being tied down to a stadium seat, so they opt out of attending. We need a wider variety of 'seating ' opportunities with any stadium redo.