Yes, it's been on Facebook multiple times.
People are definitely used to being able to just go to Gen Con on the day they want to attend / arrive, get in line, and buy badges. Hopefully Gen Con will have some kind of pre-emptive customer service people there, bc, yes, there are going to be people that are upset about it.
Anyone who isn't in the email loop and doesn't keep up with Facebook and/or look at their news feed (Twitter, also, I assume, but I am not on that) would and WILL certainly be surprised and unhappy to see that they can't get in.
But, I will say, the suggestions for volunteering are not meant to do anything but inform. Right now, you can buy Thur/Fri/Sun individual day badges. Sunday badges are good for up to 4 people, who don't have to be related. Yes, it will cost more. Those are the only options. Volunteer, or pay more, and skip Saturday. Next year will be interesting I think, because I'm guessing initial badge saies will be much more brisk!
I would buy the TH,F and Sunday badges. Try to work on Saturday, if one is allowed to work on a one day badge, or just play local games at the hotel on Saturday.
Better to miss one day then miss all of the convention.