Number 1 just seems so obviously untrue to me and this is why I don’t understand why people seem to think that nothing will change.
Not to mention iOS doesn't natively have a cursor, so how do you know where the mouse is without making changes to iOS. Then app developers -- some of whom are slow enough adding new iOS base features -- need to add in how to handle secondary mouse clicks and scroll wheels. The art apps are fast to integrate the new pencil features, but Google was slow just adding in drag and drop.
I am a huge apple fan but I can tell you right now if apple decideds in the future to add mouse support for iOS that I will continue to say they are wrong and I will consider it the start of the death of the iPad line.
I can see them adding in something like a clamshell mode. There are some times I think having a mouse would he handy. However, I have a long list of iOS features I wish Apple would implement before mouse support.