Having been a monorail pilot in the past, and maintaining good connections with the department:
Monorails aren't going away soon. 10, 12 years maybe, but Disney is spending a cool 30 million in automating the system. There is currently a trailer somewhere near central shops with the team dedicated to designing the automation.
Trains will always have a "Pilot" on board, but mostly for contingency. The hope is to prevent trains from stopping at hold points. The trains will slow down automatically to prevent stopping on the open beam way.
One of the biggest reasons the monorails are inefficient is the pilot. 20 year old trains can't be driven the way most 20-30 year olds drive. You can't B4 to P5 and back again constantly. They need love.