That's OK, that's why the deadlines were structured the way they are; in the past, Satoshi made changes like this by simply changing the code and then expecting everybody to upgrade. This is the first time we've used a more open, community-driven process.
So, since we'll miss the deadline, the question is: what next? To focus discussion, here are two straw-man proposals that y'all can agree or disagree with; I'll go along with whatever consensus arises over the next couple of days:
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Support for BIP 16/17 will be evaluated weekly, beginning on February 1 (support measured as described in the BIP). Results shall be announced here in this thread, and when support exceeds 55% the switchover date shall be set two weeks from then (with announcements made here, to the bitcoin-development mailing list, and to the Mining and Mining Pool forums). If support drops to less than 20%, then the proposal shall be withdrawn.
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To give more time for testing and deployment, there will be a new go/no-go deadline for evaluating BIP 16/17 support. The new deadline for BIP 16 shall be March 1, 2012. If 55+% support the new feature (as described in the BIP), then March 15 shall be the switchover date.
On the subject of testing... I've created a wiki page to record QA (quality assurance) testing that has been done on BIP 16. If you can help test, or have been testing/deploying, then please add to this page: https://en.bitcoin.it/wiki/BIP_0016_QA
As always, (on-topic) discussion, feedback, etc. is very welcome. If we can, I'd like to move past the "we dont' need to do ANYTHING" arguments, there is clearly rough consensus (with notable exceptions) that a short-bitcoin-address solution is needed.