I've heard some claim the league can force him to sell... Nope. I suspect a suspension will certainly occur and likely a fine... But his property is safe.
He can’t force Sterling to sell. Essentially the league constitution says the league can only sell a team out from under an owner if said owner is not meeting his financial obligations (not paying his bills) and that is not an issue. Blake Griffin’s checks are clearing. What’s more, Sterling’s style — with his real estate holdings, with everything — is to buy and keep, not sell.
Maybe the other owners could try to force the issue saying, “We no longer want Sterling as a business partner” legal argument, but the very litigious Sterling likely would fight that. And it would get ugly. Or, uglier. And it would drag the issue out for years.