Mutliple NBA only cities have built their new arena to be basketball specific, thus they are not suitable for an NHL team, like in AZ where the Suns play, Barclays with the Nets, Indiana with the Pacers, etc. down the line.
I believe from what I heard, the arena that Ballmer wants to build for the Clippers will be basketball focused, unless the Ducks want to get on board.
Chase is the same way. They asked the Sharks to join them and they declined, thus they made it basketball and concert specific.
These decisions will last for decades now as arenas won't get bigger in terms of capacity of fans, but the concourse and stuff can be expanded to offer more to the fans.
Not to mention that once built, public transit will likely be re-routed to go to the arena. Making a change to a new location unlikely in 35 years. Just continue to renovate the current arena. I don't expect many of the 90's built arenas to be replaced after 25-30 years now. Massive renovations have been done to Boston, St. Louis, and Philly in recent years to extend the life there.