Very good question, I did the diapers 24/7 for over a year. I am a DL and not incon, just something I wanted to try. So after about 5 months I was dependent on diapers, but will have to say I was not made incontinent. I wet and messed, however did more wetting than messing after an extended period in time. Due to diaper rash, if you ever had a diaper rash you know it is not something that we wish for.
So where am I going with this, after a year I decided to hang it up, however it would take me over 3 months to were i could go out and about without wearing a diaper. I still wear diapers to bed which is a good thing being most mornings I wake up wet and a wet diaper is better than a wet bed. With the GF, well she prefers I wear diapers to bed.
So to answer your question, my experience is that wearing diapers did not make me incontinent. What it did do though, was give me a better outlook and perspective of how fortunate I am to have a choice of wearing a diaper, or wearing underwear. Something i took for granit before I started wearing diapers 24/7. I have respect of those whom have to wear, they people that do not have a choice.
Got to keep it real, I can not take life for granit nor judge something i never tried.
Aloha