Why an Android addict isn't excited for Android M

The reason why companies abandon their phones is because there's no incentive for them to do otherwise. Once you've bought the phone, they're not going to get any more money out of you, so why throw money away updating it?

The only way out of this is to give manufacturers a piece of the action on apps sold through the store to users of their phones. This would align their motivations more closely with Google's.