The water based coating that was used will prevent the finish itself from gaining a golden or amber patina . It will likely yellow a bit over time but simply not to the degree that oil based poly will. At this stage , all you can do is tint a new coat and then put a final coat on top of that .
I would avoid products like minwax polyshades .I have seen it many times and it tends not to stick very well and seems to lack durability. In the times where I have sanded it, it seems to flake right off of the floor .
For more info on tinting, check out this thread :
new-red-oak-flooring-how-finish-t9675.html