I've just migrated a second question to Android Enthusiasts in as many days.
If you look at the statistics while only 5 questions have been migrated in the last 90 days none of those have been rejected.
With increasing numbers of web applications having smart phone versions I can see this being an increasing problem where people post here rather than on the appropriate phone site.
However, adding "Android Enthusiasts" would take up the fifth (and last) migration slot so we wouldn't be able to add the Apple (for iPhone) or Windows Phone site in future should we get more questions on those topics.
I have just looked again at the stats and we're getting an increasing number of Android questions being asked (I've just migrated another one). I think it's time to revisit this.