Having accepted bitcoin payments through the LN for over a year, there's definitely a growing market demand for it.

And outside of potential new traffic it will be great for current players and the site.

It will increase privacy and break the link if your payment is routed through the network.  And it will allow players to deposit and withdraw instantly for nearly no cost, so it can be done every session if they choose.  The ability to have funds in a channel that can instantly be pushed back and forth so that you don't have to give up control of your bitcoin while you're away is the future.