I think that adding the Pistons does a lot more than just add basketball games to the new arena. Yes, it doubles the number of sporting home games of 41 NHL games along with 41 NBA games.
But also... I believe that the potential razing of the Palace more than doubles the number of arena concerts and events that will be coming to the new Arena. The Palace always had more non game concerts and events than JLA did, so with the Palace events moving to the new arena... the combination of Palace concerts/events and Olympia Entertainments concerts/events will make the new arena the major entertainment venue in Michigan.
And that in turn will help increase the chances of the entire Arena district getting developed. This will likely be the "game changer" that gets the Ilitch's to live up to their promises.
If a soccer arena and ancilliary developments get built on the fail jail site, then Detroit will have the a premier entertainment and sports district practically better than anywhere... with all in one area.... 4 venues for 5 major sports... and an enormous theatre, restaurant and entertainment district mixed in.
The potential of the Ilitch-Gilbert-Gores billionaire developers working together in downtown/midtown, could result in projects beyond our wildest dreams 10 years ago.