It’s only a matter of time before sports betting is legalized in the United States. At least, that’s what Mark Cuban thinks.

In an interview with Fortune, the Dallas Mavericks team owner said it’s about time the country takes a deeper look at its sports betting laws, which he described as already “rotting in the dark ages.” In fact, the billionaire said an overhaul is “inevitable,” especially in light of the number of fantasy sports fans that continue to balloon across the country.

“It will take some time for the courts to overcome the grandstanding by a few district attorneys, but once that happens I think we will see a slow but sure availability of gambling across the country. The bottom line is that it will create needed tax revenue that states will want,” Cuban said in the interview.

Once that’s out of the way, Cuban said he also hopes to see partnerships between professional sports leagues and bookmakers formed—similar to what NBA Commissioner Adam Silver has been advocating since 2014.