Considering many of the top grossing apps on Android (and iOS as well) are free with in app purchasing, I am starting to believe paid app downloads are going to increasingly become a niche market for apps.
You're right. Last I checked free apps were like 2/3 of the total number of apps in the Apple Appstore. Now it could be higher.
I also wonder how ad-supported apps affect these numbers. If apps are free but ad-supported, there's more incentive to download and try them out, even if you only ever use them once and then delete them.
Ya, they'll get that just by the volume of Facebook, Twitter, WhatsApp, etc. downloads