3) because the current fighter's fairly generic build and ease of assimilating other parts makes it a good blank slate class, which some people appreciate having over something that brings hyperspecific concepts to the table.
I believe Mike regretted some of the decisions he put into the development of the fighter class as being too generic. You may think he would want to follow through to make it even better. In that sense I would hope there would be a revision.
I loved the Fighter/Scout so much I made it my number one choice of sub classes from UA articles to make an official book. I loved the simple focus on Exploration skills.
Too bad I don't think it will happen, though.