At some point regardless of feelings you just shouldn't be 100% committed to some else's project, of which you have very limited control (if at all). You can be 90% committed and a professional and still get a lot done and do great work.

In the company's eyes you should be 100% or even more committed. Perception is everything in this case. But you must do it by creating your own reserve space, where you are really 90% (or less) committed while using the remainder to worry about your next gig, because it will come. That's when you learn to apply proactive procrastination (sometimes it pays off to hold off on something you suspect will be cancelled), and absolutely use all the time estimated and allocated. Say whatever they want, managers and people in general take estimates for what it must be. Therefore you make it so.