They'd definitely lose popularity. Afaik this is still the biggest forum cryptocurrency-wise, so if they were a crypto casino then naturally their user base would also stem from here, or at least a large part of it. Leaving here inevitably leaves a lot of possibility for their platform to actually grow. At least, for the old ones.

New casinos even if they stay here will definitely have a hard time competing since there are already companies that have build their brand around crypto casinos. Yes they can still get that minimum by doing sig campaigns here, but it wouldn't be compared to the advantages that earlier ones had. Well it's the usual early investors = greater profits.