I think it's ridiculous that TrackIR is a Kickstarter stretch goal. It'll be laughable if KS fails to meet 1.75mil despite the combined campaign being highly successful. It should be a combined goal.
Eh, come on, we all know these kind of stretch goals are there just to entice people to pledge. It's not like there won't be TrackIR support if we don't reach 1.75M$ on KS. Chris has already been talking to the TrackIR / Oculus guys and stated several times that both are a given.