Probably not with the current level of technology. Especially given that the lifetime of the tank is not only "drive forward and shoot" - it needs to be fueled, oiled, repaired, restocked, pulled out of the mud, etc. Fully automating this would be a very complex task. Especially achieving it on a battlefield where there are people who are present there, unlike the remote controller, and do their best to try and not let you do any of that.