I have a lot of friends who work individual rosters as airline flight deck crew. I would suggest that if this roster were implemented for ATC staff we should fight it tooth and nail. My reasons are purely practical, to have any social life, never mind important issues such as child care, is impossible if your roster only extends six weeks. Nothing can be guaranteed beyond six weeks, and that excludes standby duties for sickness which I am sure would be implemented. You would have to be within two hours travelling time if called out, there goes your travelling on the days off.
I am sure that the beancounters would love it, particularly as the watch "morale" cannot be quantified, and does not show on a balance sheet.
I am also sure that if individual rosters were implemented, it would be the final straw for the more senior members of staff who would opt for early retirement instead! .