The answer is likely yes but it’s not so straight forward just yet and there are some development issues that may need to be overcome before they can get to that size.
Currently the Farmbot offers the Farmbot Genesis (5 feet wide and 10 feet long) and the Farmbot Genesis XL (10 feet wide and 20 feet long) models. These systems have been tested and they work well to service these areas. Once you get into serving larger areas the X and Y Farmbot motors become underpowered and potentially unreliable. The water pump would also need to be resized to account for the additional hose resistance. As the service area increases the proportional weight of the support structure, cables and hoses increase also. The stepper motors that the Farmbot team selected are able to work reliably for the weight of the systems they currently offer.
The great thing about the Farmbot device is that all the plans and designs are open source available online. So if you’re resourceful and you have some engineering background or some friends that can help you, there’s nothing stopping you from developing an even larger Farmbot.
I expect that the Development team at Farmbot is working on developing an even larger device for the future. It’s my opinion that the leap from v1.2 to v1.4 XL is quite remarkable and it’s increased the usable area by 4X.
What part of the world do you live in? You may be able to meet up with current Farmbot owners and see for yourself how the Farmbot works.