They'd better harden them.
The only one I've seen so far that stands a chance against a guerrilla campaign is the lil guy with an M60 mounted on it.
Still has it's vulnerabilities.
It'll be a loooooooooooooooooong time before robots will be a worthy adversary.
For now, land based robots will be pack mules....
Less men in the field or more arms depending on the mission