I didn't watch the speech and haven't as of yet read the transcript, but I've read a bit about what other people have said of the speech so I guess that's the same thing.
I don't think the deadline is serious. I don't think Afghanistan can be fixed. I'm not even so sure any more that the original 2001 invasion was worthwhile.
Among the things I've read on this subject in the last two days, one of the more interesting was a column by David Brooks, of all people. Pakistan is, and probably has been for some time, as much if not more of a problem than Afghanistan. There are also some interesting thoughts at Sullivan's blog as usual, particularly from his readers, pertaining to the utility of deadlines.
Once I come upon the transcript of the speech I'll try to give this subject more serious attention.