Two years ago, we moved to the country. Our situation was a little different than most. As part of the civil suit against the gooberhead drunk who hit exDH, our settlement included a house on a fair bit of acreage. I already owned the home we were living in at the time, having extensively renovated it. My plan was to get the farmhouse fixed up to either rent out or sell. Then difficult child 1 really started getting in with a bad crowd, sneaking out at night, stealing, drugs, etc.
On impulse, after finding out difficult child 1 was pregnant at 15 (almost 16,) I decided to sell our home and move us to the farm. I had hoped to get difficult child 1 away from the bad stuff and give both her and difficult child 2 a chance to start over fresh somewhere new. (difficult child 2 had his own history of issues, including a felony charge for assaulting an officer that tried to help restrain him during a meltdown, which resulted in a hands-off/no help attitude from public safety the next time he had a violent meltdown.)
In our case, my plans were a 50/50 success/failure. For difficult child 1, it did nothing to slow her down. She left home Christmas Day, just two short months after Rae was born. For months we didn't know where she was, or if they were okay. She claimed she couldn't stand living "out in the boonies where there's nothing," but what she really couldn't stand was being away from her less-than-ideal friends and partners in crime.
For difficult child 2, it was quite simply the best decision I have ever made for him. I'm sure part of his success was due to his sister being gone and unable to push all his buttons whenever she needed the focus shifted away from her. But in all honesty? Country life was just a better fit for him. The ability to start over, where people didn't immediately associate him with dangerous, violent behavior or being "that" kid gave him just the impetus he needed to start changing. He had a clean slate in a place where people didn't mind his quirks and eccentricities. He had a place where he could walk outside and scream at the top of his lungs to vent his frustration, without anyone calling the police or looking at him funny. (Our nearest neighbor is 8 acres away.) He wasn't forced into impromptu social interactions just getting the mail. (In our old neighborhood, even though it was a small country town, our neighbors were just a few steps away, with people always out walking or riding bikes. People would try to talk to him if he was outside - something that scared the beejeebers out of him because it put him on the spot to interact.)
Personally? I wouldn't necessarily recommend moving JUST to get a new start for difficult child, even though for difficult child 2 it was a tremendous positive. I think it really depends on the mindset of your difficult child. In difficult child 1's case, she was almost like an alcoholic being forced to enter treatment. She resisted because she wasn't ready for it. She didn't want it. difficult child 2, on the other hand, wanted another chance. He really wanted to make a new start for himself. Luckily, the farm happened to be a perfect fit for him. But in his case, he also WANTED to build a better life for himself, desperately. He wanted to try again and learn from his mistakes. Even with that, I still consider our situation more a matter of a lucky shot in the dark than anything else. I don't know that it would have worked out the same if any of 1,000 variables had been different.
Issues of age, responsibility, and that sort of thing aside, you have to decide for yourself what you feel the odds of his success are and if you're willing to take the risks that it might not help. If you're willing to accept the cost (financial, emotional, etc.) for an opportunity to help him get a new start, and you're comfortable with what you feel his chances are, then by all means try it. Each of us has to make those tough calls based on our children, their abilities, past experiences, financial ability, and a host of other factors. If you truly feel, in your heart of hearts, that this could really be a big step towards helping him, don't be afraid to make him stick his neck out a little for it (i.e. help with finding housing, looking for a job, maybe moving ahead of you guys and getting a household established, whatever) but offer your guidance and support (be it emotional or financial) as his safety net. Just be realistic in your expectations and assistance. You can't and shouldn't do it all for him. However, there's nothing wrong with helping a child who truly wants to help themselves.