In reply to Alec Kinnear.

I don't think Jetpack support should be added to Core either. The default themes are a perfect example. They don't add Jetpack Infinite Scroll support—we add a shim into Jetpack to enable it because, agreed, Core shouldn't build features that depend on Jetpack.

My point was that if any code from Jetpack can be "forked" into Core, be totally self-sustaining within Core, and Core wants it, then yes. Let's do it.