Here's my thoughts:

1. Road Transport.  This is another issue where the tech may be ahead of the legislation.  Is it legal to have a driverless vehicle move itself down the road, even with a pilot vehicle? I don't know, just a question.

2.  Prove to me it will work in my terraces.

3.  I would rather have a fleet of smaller units.  4 to 8 row sized.  Hopefully they won't all have problems at the same time.