400 million users. Wouldn't that be a disaster for Apple? All those people exposed to Apple's products and branding on a daily basis. Advertiser supported music has never worked. Just asked the radio broadcasters.
If Apple wanted to do something radical with the existing iPhone SE here is a simple 3 step plan:
1. Lower the price of the base model to $200.
2. Offer affordable data only cell phone plans (like iPad) with FaceTime for communications.
3. Drop the iPod Touch from the product line.