I have read that some AB/DL's when the have kids, the desire seems to subside for a while, just because the amount of parenting required, but there are many AB/DL's who are seniors who maintain their desires.
Asking if something like this will go away is a tad bit similar to asking if a person will ever stop being gay. Granted, fetishes/(lifestyle desires) are a bit different in nature to sexual attraction, but if diapers are a fetish for you, it can be pretty much just as strong.
The main thing is finding a way to accept yourself. It sounds a lot like you don't accept who you are, when you are questioning if it will go away, but maybe I am misreading signals (I suppose you could just be asking out of curiosity and planning for your future). There is so much freedom to be had by reaching a point of self acceptance, and so much confidence to be gained. At some point, you may find that you are slightly saddened by the idea of becoming tired of the AB/DL life.
Which brings me to the other point, is that by accepting yourself, and regularly taking care of your little side, you may find that it starts to 'bore' you sometimes, or it just doesn't fill the gap anymore. I haven't heard of anybody really ever 'moving on,' but I have heard of many who come on here and ask what they can do because they haven't felt like being little in a while. I really don't think that the core desire, and the core personality of AB/DL ever goes away, but there can be a point where you have fulfilled that need, and you spend more time on other parts of your life, to the point that fulfilling that need becomes less common of an activity.
The truth is though, there is no way for us on here to really predict what would happen for you, because the level of desire for things like diapers, is really different for each one of us individually. There is one thing that many of us have found in common though besides liking diapers, is often we each have gone through the binge purge cycle where we guilt ourselves over wanting and wearing diapers. Binge purge cycles are extremely unhealthy, and depressive. I really hope that you don't have this issue to deal with, and if you do, it can be very helpful to decide a schedule to take care of your little side whether you want to or not, after a while, it becomes regular, and then you become less ashamed of it, and eventually you appreciate it. Afterwards you can lessen the amount of time you spend on it, or increase it, depending on whatever makes you comfortable. When you get it under control, you are much better equipped at figuring out how much time you need to spend on yourself taking care of your little side, and you spend less time harming yourself with loathing and pity.
For me, I went through a lot of binges and purges, and eventually I forced myself to spend time in a diaper every night even if I didn't want to, just so I could get over the moments when I felt disgust with myself, then after a few weeks it became normal and I stopped caring about it, and enjoyed it on the moments when I really wanted to wear. Now I have found that I prefer to wear 24/7, but that is just my preference, others find that they just like the weekends, or maybe 2 times a month, or whenever.
I hope I didn't overshoot your question with too much talk, sorry for the long post.