Needs a bit more than that though doesn't it.
it needs drills to match the mini robots etc. And unless everything is wanting changing all at the same time it just adds additional cost.
And at the end of the day is say 10 mini drills and mini robots needed to pull them going to be cheaper than 1 big drill and robot tractor?
Again all down to unit cost per acre. Non of us know the answer to that one yet!
As you say we don't know yet but take away the weight and you take away the need for cultivation
Increase the definition your working at and you take away the need for blanket spraying / fertilisation as well
The machines the robots will use will simply be small versions of the machines (drills) we use today - not a lot to develop there really is there ?