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<personal opinion based on many conversations> Teachers and administrators think that such changes will lead to lower salaries or outright loss of jobs.</personal opinion>

As someone in the field, I can understand their concerns from a political perspective.

From a political perspective, if technological improvements can provide an education that is comparable to current standards then there will be politicians that argue we can drastically reduce our number of teachers and administrators and save taxpayers a lot of money.

From an educational perspective, even if we were to implement all of the technological solutions that we could there will still be plenty of need for teachers. Such implementations would change the role of teachers, but not eliminate the need for them. The closest cases of such changes are "flipped classrooms". Knewton has an infographic that covers the basics - http://www.knewton.com/flipped-classroom/