It's not in Canada, so Shoppers has nothing to worry about.
Not sure how much they'll be interested in the Canadian market - our drug costs are so much less here that profits are pretty slim - basically nothing on the drugs in a lot of cases, only the dispensing fee. To the contrary in the USA, there's profits to be made on the drugs themselves - a fairly significant profit in many cases.
Never say never I guess, but it's potentially a lot of regulatory hurdles and investments necessary for what may be considered a pittance of profit here comparatively.