I'll note, there is no gambling on the DCL line, and to many consumers that is a turn off (I personally know many people who say they won't do DCL because there is no gambling,for example).
Disney has decided that they won't include it as a perk since it's still seen as a marketing advantage publicly at this point in time, and rather they focus on service and experience. People who don't care for gambling, or cast aspersions upon what gambling means (rowdy people, drunks, low lifes), will spend through the nose to go on a DCL cruise. And those who wish to gamble, well, are not part of the business model (at this point).
However, talking numbers, at some point I suspect DCL will cave. I hope they don't, but I suspect eventually they will once the next generation of Harvard (or other schools) educated asshats takes control.
At some point, as DCL grows, they will look at their competition, and say...well, we can do just this one thing to allow some gambling...to attract part of their business. And then eventually they'll go full out and allow it.
Spirit knows what he is talking about when he says red vs blue seas. Right now, DCL is sitting in a Blue Sea market, so they do what they wish. That will change, as investors will still demand higher returns, etc.
Eventually, they'll join the Red Sea that is the cruise market as they become less of a footnote, and more of a competitor...and, I suspect management will react predictably.
They let booze into Magic Kingdom (not something that was a big deal to me personally, but it was a major change of a decades old policy). I don't expect the current management gives two flips anymore...sorry...
As we used to say at CEC...Profit is King.