2 cruises a year

What would happen to the stock price at least in the short term, if all, or at least most of, the "I bought the stock for the OBC" group sold off en mass due to losing the OBC?

I don't think that they will touch the Military Benefit. I think that they truly believe in it. But if they did touch it, it would not look good. I also don't think that it really costs them that much. It doesn't cost them dollar for dollar. Just as a rough guesstimate, it probably costs them in the neighborhood 50 cents on the dollar. And, in the whole scheme of things, I think that it is a pretty small percentage of the total passengers that qualify for it. And that percentage is decreasing, not increasing. Fewer Military today than in the past. It will gradually keep costing less, without the public relations nightmare of eliminating it.

As far as I can see, there isn't any reason you alone can't buy the package. This is from the Princess website. https://www.princess.com/ships-and-experience/food-and-dining/beverages/ Be sure to read the Terms and Conditions https://www.princess.com/html/global/personalizer/ssv/beverages/disclaimer/