You can't occupy territory with drones (yet). You will need people and moving people in a drone-infested environment will mean protecting them with armoured vehicles. Yes, these vehicles will need enhancements and other new tech to counter drones, but armoured vehicles aren't going away (MAYBE the tank's days are numbered, though).

If you are really interested in this, I highly recommend subscribing to war on the rocks. Their articles and paid podcasts have legit defense industry people publishing studies on this subject. https://warontherocks.com