There are acres upon acres upon acres upon acres upon acres of room for all of the infrastructure needs and the spectator requirements at CB--it is quite a bit better identified in person than on any aerial or fore-shortened still picture. The Pierce County "Event Grounds" (don't dare call it an amphitheatre, lest you get the stink eye from county administrators) just south of the course will be a great staging area for passengers coming by train or ferry, as well as home to all the USGA merchandising grounds and many of the "tented village" requirements...
There is the entire "high" perimeter of the course, from the back of #12, behind and left of #13, behind #4, #5 tee, #7 green, high and left of #8 and behind tee #9 which can be bleachered, if necessary, to provide a massive stadium approach, albeit with binoculars, to much of the proceedings.
Although not many of the holes can be lined both sides by bleachers, most of them can take them down one entire side or the other. In addition, there is a public walking trail through many areas toward the low side of the course, and bleachers can be plopped down on top of those trails quite easily.
As far as the dunes themselves, they are not (at least not for a while) designated habitats for any Puget Sound endangered species, and they can be trampled over, around and under with impunity. Spectators will likely be able to traverse them, limited only by their own physical abilities, as was the case at Whistling Straits. The able-bodied will get some spectacular views of the action from above the #10 green for example...
I will talk to the folks on Wednesday, weather-permitting, and see if there is any thought of monkeying with the driving range area, as that could also be altered for corporate box/merchandising, etc...
I don't think that limited ticket sales ever entered into the discussion---quite the opposite. Given the scarcity of men's professional golf up here, I bet they are planning quite the reverse, that the boffo ticket sales will make up for some considerations they have to make elsewhere, such as Merion...
The turn-out in the NW, which includes Portland and Vancouver, for an event here could be extraordinary, although it's always tough to project out 8 yrs....A lot depends on other factors affecting professional golf which have nothing to do with whether it's in Tacoma or not...