Yes, not only would Froome be in the select club of riders who have all 3 GT titles (Nibali being the only other current rider with such a palmares), but he'd have won 3 consecutive GTs.
Such a feat would make him the GT rider of his generation.
Contador and Nibali the only ones in the same tier.
I like Froome very much and find all the vitriol he receives saddening, as he's a very pleasant guy who never gets ruffled. Many others could learn from his dignified approach and attitude (like that plonker Wiggins for a start).