I have adaptive cruise control and a lot of other technologies that projects like this use (lane assist, blind spot warning backup camera/radar etc) and I can honestly say it has made me a much worse/lazy driver. I find myself constantly relying on these solely instead of a check on my natural abilities. This is with me consciously knowing relying on them is a really bad thing.
My anecdote may not apply to all but it certainly concerns me to the point of wanting to not use it. It reminds me of people in Oregon traveling to other states who have no idea how to pump gas because they do it for you by law there.
They work great though and it would be awesome to actually be able to only rely on them but I worry about the hybrid approach because they are merely driving aids at this point and I can see people using them as pseudo automated cars and the long term negatives outweighing the positives.