Moving the old Questions/Answers without "enough" (most for small sites) of the active users also commingcoming is pointless.
The small sites depend on being shown on the "hot questions" sidebar to get new users.
If a new site had most of the experienced/active users, it would not need the content from the old site to be useful.
And how would a new site keep the experienced/active users happy while making enough money?
However I can see how some "tags" from StackOverflowStack Overflow could move to a different site, if the key developers in these tags with well read blogs decided to make the move. SomehowSomehow students and other people without programming expertise will need to be kept off the new site, while at the same time being welcoming to anyone who can quickly learn how to ask good questions.
StackOverflowStack Overflow was possible due to two very well read blogs directing their users to the new site, and these two blogs having the most expert programmers as their readers. SolvingSolving the "chicken and egg" problem is the hard part, not setting up a website or copying old content.