The handwriting on the wall suggests that Blogger is trying to get everybody (every account anyway) onto Blogger Beta before the end of the year. This doesn't give us much time, though.
The last week of the year, which starts one week from tomorrow (on Christmas Day, yet), will probably be a 4 day work week. Some companies may even observe 3 days of work, and maybe less work will actually get done. Your access to Blogger won't be subject simply to Bloggers stability.
I wouldn't try migrating then. Particularly if the bulk of the unmigrated accounts get migrated the last week, the load on the Blogger infrastructure could be interesting. I wouldn't want my migration job depending upon servers that are overworked right now (supposedly, one of the original reasons for migrating).
And another complication. If last years observations repeat, you'll see Internet stability drop during the last week of the year. Think of all those lucky folks who see their first computer under the Christmas tree, next Monday. Think of what happens as all of those computers get connected for the first time, and all of the new bots get added to the bot population.
If Jordan et al are expecting to get this project finished before the end of the year, they better have coffee, by the gallon, ready for the final week. They are going to be stuck in the office for some grueling long hours.
That leaves this week. Period. And unfortunately, that is subject to the invitation being available.
This is the 2006 Holiday Season. I am surely not the only webmaster who seriously wants his / her website up and running, 7 x 24, during this season. See Roberto's Report: Yo! Ho! What's the Go?, for more thoughts on this issue.
Jordan et al:
If you think some of the bitching in the forum this weekend was annoying, wait til next week, and the final week, if you keep hinting that we will be forced to migrate before 2007.
Please stop The FUD.
(Note 12/22): I would probably not migrate this weekend, period. And with this issue in mind, I would limit my migration window next week to 12/26 - 27, no more.