Physical casinos offer a good experience than online gambling, however, due to the pandemic, people learn that gambling online is easier and cheaper, so Physical casinos revenue has decreased due to the restrictions, and for them to survive and stay profitable, they have to compete and operate an online casinos business also.
We should not limit the function of a physical casino, all of them operate for profit, and if they find an opportunity to boost their profit, then they will not hesitate to start accepting crypto as it's popular nowadays.
But the fact that physical casinos will begin to accept cryptocurrency does not mean an increase in its applicability. As I wrote above, casinos will accept cryptocurrency through the 3rd party (possibly an exchange) and in fact the casino will never have cryptocurrency on its account, since at the moment of payment it will be immediately converted to fiat.
to accept directly in fiat but this is actually on owners preference but talking about integrating crypto currency into their games then it would surely take a while or wont really be that possible
for these years but talking about acceptance and adoption then we are really surely heading there.