Going back to the network effect, if android gets like 80%+ marketshare, you will damn well care about who sells more because the market will drag developers, kick and screaming, to develop more for android than for ioS. That's the same reason why i can run a helluva lot more software on my PC than a mac user can on his mac.
I don't know if they'll get 80% though. They haven't done it in mobile phones and they've been dominating in that space. Also, if the average Android user doesn't buy apps or isn't willing to spend as much money, it doesn't matter how much market share they have.
Another important statistic to look at would be market share in the U.S. and Europe. They developers there are going to be producing most of the apps that people in the West are going to use, and the proportions of iOS/Android in those countries are much closer than in countries like China or India where Apple doesn't have as large of a presence.