Apple is going actually in opposite way and you can see it with recent changes on iOS. To run apps on iPhone, you don't need to buy a developer licence for 100$ anymore. They support more extensions for apps. On last Apple keynote Microsoft was presenting Microsoft Office running on iPad Pro.

The special licence you are talking about actually exists. You can sign your Mac apps with a certificate and it will not ask a user if you want to open it, but this is not restrictive at all. This is actually a benefit because nobody can modify your app so if they would force this, I wouldn't mind. Most of apps that I use are signed anyway.