Everyone wants instant gratification these days! This is not GM making an arbitrary decision this is a legit safety issue so if you have to wait a couple more months big deal.
This may be a positive for some members like myself. I am waiting for pricing to be released on the Z/28. That will be the determining factor as to whether I purchase a ZL1 or 1LE. Also prevents me from making an impulsive decisions due to a lack of patience,