Well, until Portra 160 and 400 are actually not made anymore, I'd shoot them. If and when they get the axe, your best alternatives are probably Fuji 400H or 160whatever-it-is-if-Fuji-still-makes-it.
Kodak filed for bankruptcy protection. While that can certainly end in them going out of business and Kodak film being no more, it does not have to end that way. The whole point of it is for Kodak to get there stuff in order so they can stay in business. So I think we'll have Portra at least for another year or so. It wouldn't necessarily be a bad thing if the film division was spun off as a separate company either.