A restart wouldn't be fair to everyone, especially to the those that spend a great deal of money on packages at the start.
A mistake occurred - they can't change anything without upsetting many players and leaving it upsets many. They've chosen to leave it as the lesser of two bad options.
It was actually started 12h early - at 02:00h UTC instead of 14:00h UTC so someone entered the time wrong somewhere for the automatic opening of the world. Whilst it is challenging, when I looked at 07:00 UTC this morning there were only 125 players who'd spotted the error and were on the world. This number will now have increased, but surely a skillful player will overcome little difficulties like this in the course of the 3 months or so that they will be playing to get to the centre and kill the fortress.