Some chameleons definitely do much better free ranging than others (I won't say all, but probably most). But permanent free ranging comes with its own considerations so you will have to keep these in mind:
1. Water. It's much harder to control misting and dripping and drainage in a free range. Definitely consider these factors first when designing a permanent free range.
2. Lighting. You still have to provide heat and UVB but without the chameleon being able to touch the hot lamps.
3. Food. You will not be able to free feed them, so you'll have to start handfeeding or get them used to eating bugs out of cups/containers.
4. Safety. Chameleons will not usually leave their free range if it provides everything they need but if they do you have to make sure that they cannot get themselves in trouble. So make sure they can't get eaten by other pets (Cats, dogs), they can't get into dangerous places (toilets, other open water, electric cables, lamps, fireplaces, etc.), and can't wander outside.
But when all these things are considered free ranging can be a really rewarding way to keep a chameleon, since you see a lot of behavior that you wouldn't in a cage. You just have to be smart about it and have the experience to recognize issues and how to correct those issues.