So only cars that "self unlock" are affected right?

If you have remote but no self-unlock it should be okay, for now.

Toyota has a way to turn on and off certain features from the lock system by reprogramming using a pattern of opening and closing the driver door and inserting/removing the key. Same way you add/remove fobs.

So it might be possible to turn off self-unlock. You'd have to find the dealer manual though.

added, or google it: http://thepoch.com/2013/automatic-door-locking-and-unlocking...

http://www.toyota.com/t3Portal/document/om/OM33856U/pdf/sec_...