What now for Rosenborg?

As I stated in the links, Rosenborg was knocked out of the Champions League by Viktoria Plzen yesterday. They will now be moved to the Europa League Playoffs, and they will find their opponent tomorrow.
It hasn't been a good season for RBK, since going undefeated last year in the Tippeligaen, making it to the Champions League Playoffs and the Europa League group stage. The biggest problem for a team like Rosenborg is their youth. In order to get the greatest talents to join the squad, they need to find them young. There are only a few that are over 24 years old on this squad. When young players hone their skills and are prepared to become the best player they could possibly be, larger squads with deeper pockets come calling. RBK was devastated by attrition this year. Even today, Midfielder Per Ciljan Skjellbred is going to move on to Hamburg. Another hole.
RBK sits 8th on the Tippeligaen table now. The only way to compete in European competitions next year are to A) win the Europa League (not likely) or B) Win the Norwegian Royal cup, which is substantially more likely, but certainly not a certainty.
Rosenborg is the most storied club in Norway. They will almost certainly be back. This has been a disappointing season, and next year will likely be excruciatingly dull, but no doubt about it, RBK will be back soon.