I would think that there would be an opportunity here to raise children with a healthy understanding of the purpose of diapers. If they learn from a young age that even adults wear diapers from time to time for certain reasons, it can help remove the shame and taboo that is often associated with wearing diapers after being toilet trained. They have the opportunity to see them as simply clothing, and nothing more.
But this would be a fine balancing act. Children often seek to imitate adults, and in such cases would likely want to keep wearing diapers themselves. Perhaps during the toilet training phase, you could lead by example by showing that you too can live without diapers. Let them know that you are patient with them while they develop their own ability to use the potty, but reinforce that it is important to you that they eventually demonstrate this ability, even if they want to wear diapers for the sake of wearing diapers. Let them have the security if they need it, but encourage them to get to the place where they can live independant of diapers. Then, if they continue to show an interest in wearing but are able to use a bathroom day and night, lay some ground rules, guidelines, and limits to this. Let them know that they must keep themselves clean and will need to take over that responsibility. Let them know that diapers cost money, and there will be limits to what they can use. Let them know that you would prefer them only to wear around the house, and not at school, church, or when visiting friends. And let them know that if others learn of this, that there may be a wide spectrum of possible reactions, and how to deal with it.