Is there any chance that anyone will ever invent a robotic weed puller?

There are so many things that people can do with robotic devices, even medical things. And, when it comes to weeds that are growing in with desirable plants, you can't just plow tham out, because the desirable plants would be plowed up, also. And herbicides wouldn't work either, because, even though they'd kill the weeds, they'd also kill all of the other desirable plants. So something that would remove the weeds without people having to do it in the old-fashioned manual way would be immensely helpful. So, why couldn't anyone invent a robotic device that can scan plants, determine which ones are weeds and which are not, and then CORRECTLY pull up the weeds, I mean to where even all of the roots are pulled up?