If I remember correctly, research was suspended on the project after a live fire exercise. Because the military didn't really have a doctrine/policy on unmanned ground vehicles with autonomous threat identification and fire control at the time, they didn't really want to start going that path and decided to stop at the tech demo stage.
Land mines are typically stationary, so there is less risk involving civilians, in theory anyways. To a greater or lesser extent, one can make the argument that a victim of a land mine is directly involved in triggering it, and aside from weight/force sensors for triggering anti-vehicle mines, such munitions normally have no inherent target discrimination capability and fall under the "everybody loses" category. A UGV that thinks a school bus is a troop transport and fires on it is a whole other beast.
That said, a mobile suicidal UGV that lays in wait for enemies is interesting, especially if you can mass produce the chassis at low cost. Bonus points if you can reduce the chassis size and use explosively driven piles/rocket anchors to stabilize the vehicle before firing, reducing necessary vehicle mass for firing stability. I suppose there could be some interesting work in incorporating solar cells with COTS embedded computers and sensors on an oversized RC truck chassis. Having a small horde of the things rushing your positions after they pop out from the bushes would be utterly terrifying and difficult to defend against due to sheer numbers.