Aye. Its not unusual. When your diapered and go the instant you feel the urge to, your bladder does indeed get smaller. Just like any other muscle, the less you work it, the more it begins to atrophy. And with it being smaller, you have less space to fill, so you will find you need to go more often.
As for whether being diapered 24/7 will eventually cause a loss of control: It depends on the person in question, both biologically and mentally. If you subconciously desire to lose all control, the eventually you will. As for biologically, its the sphincter muscle that controls the 'flood-gate' of your bladder, so keeping your sphincter in a permenantly relexed state will, in due time, cause the muscle to atrophy.
So, will being diapered 24/7 cause you to lose control?
Not if you don't want to.
Hope this helps.
Lil Reph.
Stay wet, stay lucky.