Mmm. I'm not sure it's about "realizing that DL isn't sexual" so much as it is taking a sexual thing and making it less sexual. Consider the stereotype of an older married couple who rarely have sex anymore. It's a stereotype because it's true! People get bored of having sex with the same partner over and over, and they also (hopefully) start to bond with their partner in other ways. That doesn't mean the relationship isn't fundamentally sexual, it just means that the prominence of the sexual component has changed, probably because it got "old."
With that perspective in mind, it's no wonder that so many of the 24/7 crowd seems to find themselves in the "comfort DL" boat. For something sexual, it becomes overdone and boring, but at the same time takes on a new role.
I don't see myself going 24/7 anytime soon, and so I suspect I'll be aroused by diapers for years to come. (Was that a bad pun? Unintended!) When that stops, it likely won't be due to some epiphany about the true nature of a diaper habit. It'll be because I overdid it or because my hormones are gone--the latter of which probably applies to the OP, but for very different reasons.
(And just to be clear, when I say "overdone," I don't mean that in a bad way. I just mean "done with such frequency that sexual attraction becomes unsustainable.")