Apple is the biggest company in the world, they don't need to accept Bitcoin because people will buy their products either way. If that happens it won't be soon.
No i guess it is not the biggest company when we say any comparison there are many great companies around the world and apple is one of it. Actually if apple company is open for cryptocurrency then definitely it will be another level or milestones when it comes to their sales on their products. Imagine the marketcap of bitcoin that flows in the market, relatively huge money is there so if apple is planning to attract those investors by incorporating their products to cryptocurrency then they will be highlight also in cryptocurrency, for the investors and they could expect huge sales.