The reason investors would have doubts about RCN emerging from bankruptcy has to do with the question of whether their shares will survive the process--not whether RCN will survive.
RCN will not disappear off the face of the earth. That, my friend, is a certainty. If, for some reason, they cannot come to an amicable settlement with their creditors, they have extremely valuable assets (including 1+ million subs) that would quickly be purchased be a competitor.