I looked at some of the forum posts and speculation about Ushuaia back in 2009-2010. There was a lot of skepticism. 12 years later, we know how Ushuaia, and now Hi, have turned out. Not a direct comparison, but just thinking about who's involved and what they may be planning.
I doubt they would keep the capacity at 10,000 (although I'm not sure I ever saw it at capacity even on the biggest nights).
I imagine something more along the lines of combining the Ushuaia/Hi experience in a more contained environment. Significantly reduced capacity to support more VIP, maybe more rooms, and even a restaurant. Running day and night.
Haven't been to Tox, but maybe Destino/Tox is another potential comparison?
I also saw a heavily-attended rock show on the beach in San An's bay this summer. Looked like a make-shift festival setup. Across the street from Es Paradis. There may be appetite for different types of shows in larger venues. Not necessarily just for big acts.
All speculation. But it seems like they could take a chance on a mega-experience that caters to a broad crowd. Potential problems: location, no connected hotel, competition with other events, etc. all have to be taken into consideration, of course. The building looks like it needs serious love and attention.
Mostly, I'm just curious to see what they do!