I think it is a matter of people or a representative agent of a crypto casino talking with the owners of a traditional casino, very well you can set up a part of the traditional casino and place a PC that draws a lot of attention for different games, be it roulette, poker, Blck Jack, and being able to carry it out. For this, it can be taken into account that the possible association of the traditional casino wins a considerable percentage so that it likes the option of continuing to put more online casino machines, really no casino has taken this initiative, but it would expand in a great way because it is terrain that has not been explored.
i guess, this kind of scenario will soon be possible to countries like el salvador as they adopt bitcoin in their system. but for countries who are not yet legally adopting bitcoin in their financial system, would be hard to see crypto in physical casinos. they may set-up bitcoin ATMs within their premises, but not directly using it inside physical casinos.
once physical casinos accepting crypto showed a major boost in their revenue, then, maybe other physical casinos will follow thru.