The fact that it takes sooo long, and that the fix will be bundled in a blob with all sorts of other "fixes" gives me the feeling that one attack-vector cannot be closed until another is available. I got this feeling years back when a huge back-door-enabling was not closed for months until big fat service pack was issued that "fixed" it (amongst fixing a million+1 other things; probably opening the next attack-vector).
Call me paranoid.