Well, from my brief experience (two visits), the islands have lots of hotels, especially Bora Bora. And they are more or less "full" of people who are not cruising. My last trip back, the airport was jammed with divers, particularly. A much younger crowd than the cruising set. Then there are the honeymooners.
Of course, you would have to look at the actual hotel capacity of the Societies and Tuomotos, and then find out the occupancy rate, to really tell.
But no, not everybody cruises.
