Sorry, I appreciate you don't like the term 'wound' - it's meant to be descriptive, not judgemental. However, it is absolutely trying to close up. That's what the dilation is for. You wouldn't need to "maintain the depth" of an actual vagina. This is a surgically constructed cavity. And yes, it's lined with skin from the penis or bowel, which means it's not self-cleaning like a vagina is, and is subject to things like growing hair inside, getting infected, smelling bad because it's hard to clean, etc.
It's definitely a huge surgery to go through, with potential for huge ongoing issues, and a lot of issues in terms of sex and dating. I would think it's probably very traumatic. Yet another reason why putting Ella into the public eye is probably not the best or kindest thing to do.