New XR cases, however special, can of course never be as "big" as was, say, the first iPod or the first iPhone itself. However, much as the thread starter, I wouldn't be surprised if Apple came up with a special line of cases to complement the colorful phones, which would allow for individualized colorful combinations. The cases, thus, become much more a part of the phone experience than before with the X or the 8. This is very much what goes on with Apple Watch as well. What is big about this is that Apple more and more turns into a lifestyle company rather than a tech company. Of course this has been going on for a while, but it is indeed interesting to see, should this prediction be correct, that Apple emphasizes the lifestyle aspect now also within their iPhone line.