I would have thought so too, even if you are allowed to kick it before it is still half way over the line, by the time it leaves the boot it will likely already be more than halfway over the line....
i guess my point is the digital or camera review has such poor resolution you wouldn't be able to conclude one way or another, so the original decision stands, unless it can clearly be seen to be an absolute howler....
So if it was ruled a point initially by the umpire, that decision would have equally stood