RTP announced that they have already thought about the format of FdC 2018, and that it's very possible that next year instead of just inviting a few composers, they will do a mix of invited composers and songs selected by an open submission.
They are also considering the possibility of revealing the songs before the shows, instead of keeping everything secret, but they will only fully decide everything after ESC 2017. Anyway, it's pretty much guaranteed that they are not withdrawing anytime soon!
I hope we won't- But for that Salvador needs to finish in an awesome position. Like top 5.
I don't think RTP should/will think like that. Just a place in the final should be enough to make them eager to continue to try harder, or top 20/15. They won't be greedy/sore losers to the point of "top 5 or we're out"