My own position on the matter, as I have already elucidated on Skyscraper Page: I'm ambivalent about the casino, but I think there are ways to do this complex with better urbanism.
I specifically have reservations on that frankly-ugly rooftop French village (which reminds me of that equally-ugly Blumenfeld Lofts 600 proposal), the skybridge across 15th, the location of the parking, the proliferation of blank walls, and the sacrifice of three prime building lots on the 1500 block of Vine for prettier-than-it-is-now-but-guaranteed-to-be-disused green space. I am also leery of the fact that they are not proposing active use in the Inky's old printing house, a beautiful old industrial structure that would be an instant destination*. The closest analogue to that space, potential-wise, is Poznan's Old Brewery (widely considered one of the most exciting retail environments in all of Europe).
My suggestions are thus:
1. "Rooftop retail" might sound cute, but in practice is much to gimmicky. Use the retail to link Broad and the casino together...through the Inky printing house, whose horizontal orientation and post-industrial vibe guarantees unique and perhaps even destination retail space.
2. Use the rooftop for entertainment venues. A band shell, concert venues, a restaurant or two with a view, would be far better suited to its strengths than retail.
3. On that note, get rid of that "rooftop French village". It's ugly. A green roof would be much nicer, and would work with the band shell I suggested.
4. Have casino-support functions (eateries, etc., perhaps even a high-roller room) front, or at least be visible to the street as well as the casino. If the casino is supposed to be primarily located on the second floor, have the support functions clustered in easy-access venues concentrated on the first floor.
5. CCP is right on the west side of this complex. Add retail along 16th catering to students there (as well as casino and complex staff).
Remember, when done poorly, casino complexes suck life from the street and the city. Atlantic City is proof positive of that. My proposals (more like coachings) are meant to achieve a balance between casino and city, and better take advantage of the site's strengths.
* The most recent info I have on the matter indicates Blatstein is intending to (a) repurpose the Glaxo garage, (b) add a new parking structure on the main casino structure, and (c) convert the Inky's printing house for parking. The latter would, of course, destroy the space's considerable potential.