Al's updates are always at best what Disney is considering, certainly not set in stone. He's on occasion said things are coming for sure, and then they either didn't come to pass, or were greatly delayed.
And in the case of the separate ticketed event, he clarifies by saying this is just an idea.
Before you go looking for a pitchfork or torch to help lead a mob to take over the Team Disney Anaheim building,it’s important to remember that this plan to turn the Christmas parade and fireworks into extra-cost options at exclusive parties still doesn’t have the executive green light, but the fantastic numbers and overall improved experience from this past Halloween certainly make the case for 2011.
So I think it's a distinct possibility, but not set in stone.
After all, there was a precedent for the Halloween party to exist, but closing the park before Christmas would be a new thing for
Disneyland. And frankly, there are a couple weeks in December where attendance is so light during the week, closing the park early on a Tuesday to offer special nighttime entertainment and "reduced" lines probably wouldn't be terribly compelling for guests. Plus, December has on average about 5 times as much rain as October. There wouldn't be trick or treating nor the ability to dress up. So selling the party almost exclusively based on weather-dependent aspects could be even more problematic than doing so in October.
I don't know what they'd do that would make it a "party" attractive to locals, and IMO they need to have that aspect to make money from the event. If the local audience doesn't see the appeal, then they'll be running the attractions and parades for a tiny crowd. Will locals really pay $40-$50 to see a parade and fireworks show they've seen every Christmas for years now, many with no out-of-pocket cost (using their annual passes)?
Looking at Disney World's offerings, I guess Disneyland could bring free cocoa and cookies? Doesn't quite sound like a party to me, but I'm not a local.
It's probably a good idea to complain vocally and especially to Disney if you don't like the idea. But it's not a given that this will happen. I'd say it's a time to try to find a way to tell Disney how you feel, not to lament how awful it is.
(Though I don't think this upcharge has much to offer compared to the Halloween upcharge and I don't think it's a good idea, I wouldn't compare ANY potential upcharge to any disasters involving a loss of life.)