It could be smaller, but more financially sustainable if things go as planned.While you've probably had a consistent experience going to the pharmacies operated by Walgreens Boots Alliance (WBA 4.19%) over the years, that doesn't make it a company that's in stasis. In fact, within the next three years, there's a very high chance that it'll be changing in a handful of ways that are relevant to investors.But even if the retail experience doesn't shift much, there's reason to believe that the stock's value wil ...