It seems a distant prospect at the moment, but ultimately the restrictions were largely lifted on the basis of political expediency rather than anything else. Pretty much ever since Omicron started circulating, we have known that it is mild but highly infectious - yet it is taking until this Friday (conveniently timed to coincide with school holidays) to remove the last of the restrictions.
Restrictions weren't removed on the basis of being unnecessary, disproportionate or because of their impact on hitherto assured liberties. And no-one has guaranteed they won't return. So if/when the "data is concerning" again, there's nothing to stop restrictions from returning.
I really hope not, but after 2 years of often illogical restrictions being introduced and removed at entirely arbitrary thresholds and with fallacious reasoning, I don't have any confidence left.