The facts of what constitutes a sufficiently-accessible website necessarily have not been discussed, because Dominos was trying to boot the case before any factual determinations were made.

Their argument was that, as a matter of law, they could not be sued under the ADA based on their website. This argument prevailed at the District Court, lost at the Ninth Circuit, and was unanimously declined to be heard at SCOTUS.

That sends a loud and clear message, and this will essentially become the law of the land for at least the next few decades.

Note: I have not deeply read all the opinions, but I am a lawyer who is familiar with appellate procedure and the ADA.