In that context market share is meaningless. Look at the number of units sold - it increased 20%. In other words you have more potential customers than you did a year ago and it is still growing. A growing market is a good thing.As an iOS developer, I'm wondering at what point I should abandon ship and switch to Android development. There still seems to be plenty of cash in iOS dev at the moment but how long will that last with a decreasing market share?
Throwing that out to switch would be silly. It would make much more sense to expand into other markets - Android in this case. Not to mention abandoning one platform for another wouldn't exactly endear you to your current customers and might give pause to those on the new platform.