This is getting dangerously close to tipping, but...
There may well be such an attribute, but I was of the impression that adaptability had to do with how well they adapted to living in a different country.
Don't know what makes a player fit into a new position, but I suspect age has something to do with it. It's probably easier to get, say, a DR to adapt to MR than ST, or a DC to DL than ST too.
Have tried to get players to new positions, but it's usually not a success. Players say they are not happy about it, and then I just drop it.