Great questions! Showing my working, which cannot help but partially come from direct personal experience (I'm very sorry for daring to give a personal perspective on something that I literally am and which is directly relevant to both myself and those living similar journeys)
1: Not reliably. There is at least one oft-quoted study indicating that social class is a significant predictor of persistence amongst the cohort sampled, but that study admits flawed methodology and also conflicts with more recent ones about the overall rates of persistence. Small sample sets are, of course, often actively worse than none at all due to their potential to be hugely misleading - and it's important to examine the actual wording used - for example "20% of youth engaged in gender-nonconforming behaviour before puberty will report a transgender gender identity as an adult" isn't saying what it initially looks like it is saying.
From my own perspective, I engaged in little outright 'gender-nonconforming behaviour' before puberty and yet it was very, very clear and unwavering to me that I was transgender.
It's clear that desistence occurs. It seems to be weighted to some extent by the intensity of expressed gender incongruence. The rate of desistence may have a social component. It seems to stabilise in the critical age range around 10-13. I'm not aware of a large study that has followed up with detransitioners (2nd transitioners?) to ascertain how many of them have since retransitioned again, but I know some of them and the overwhelming stated reasons for doing so - which map directly onto other studies that have shown a sizeable portion of those who detransition do so due to encountering familial or societal prejudice and difficulty in general life.
2: I'll get back to you once we've found a good definition of what 'naturally resolve' means, because from the large numbers of adult transitioners I know who share a recurring narrative that they knew they were trans years beforehand but either didn't know how to access treatment, didn't have an 'official' diagnostic tickbox saying that they were trans as kids and thus failed to act on their feelings and assumed they would go away, or were concerned about the available technology to facilitiate their transition and expected things to change later - well, there certainly wasn't any 'resolving' going on there. I know several kids who - right now - are being denied access to treatment that would massively and positively affect the trajectory of the rest of their lives due to chronic underfunding, parental interference and the ongoing effects of a culture war that enshrines overriding their own stated experiences as a core tenet of faith. They are righteously incensed by how catastrophically they have been failed by our health service, and they will bear that anger for the rest of their lives - long after many of the current culture warriors who have been instrumental in creating this climate have moved on or died.
3: I used to think being (what I would have called transsexual at the time - always disliked that weird and clunky misleading term) was a state I wouldn't wish upon anyone. Even then, I was able to recognise that this viewpoint was largely due to the weight of societal prejudice that existed against transgender people - of course I wouldn't want to wish a harder life on anyone. I also was well aware of the practical realities of transition - they certainly don't hide that from you. I chafed against the idea that I had to somehow be sorry or ashamed for what I was - but I couldn't help but internalise it. My perspective on the matter was very heavily rooted in my own, overwhelmingly strong, experience of gender dysphoria throughout childhood. It was miserable. I certainly wouldn't want the number of unhappy people in the world to increase. However, there's an essential logical leap we're skipping over here - does the treatment make people trans, or does it increase the likelihood of them transitioning?
The only reference point I have is my own, of course: Would I have transitioned if blockers, hormones and surgery weren't available? I can't say for sure. I already had to wait some time for them and it was excruciating! Would I have been as happy as I am now? I can absolutely and categorically guarantee that answer is no.
This is just one perspective. But it's not an uncommon one.
The question presupposes that being transgender is an affliction that you 'recover' from. We've been here before, my friend.