Since Norm has been around, I feel like the statement "they may fall off next year" gets said after every season. At this point, they are a very system based team and are built/recruit around a broad team perspective. The last Frozen 4 team dressed 6 FR plus had Helly leading the way at the end of the year. Every year, new guys come in and just fill into those roles. Wilson leaves, CJ Smith comes in. Ruhwedel leaves, Kamrass fills in. Kamrass graduates, Zink/Kapla fill into that role. Pendenza graduates and Gambardella fills into that spot. Carr-Helly-Boyle. The list goes on. The staff does a very good job of progressing players into those roles.
Just from watching them over the past 5 years, I think the bigger issue would be how do they get over the proverbial "hump". Obviously if you said before Norm came that Lowell would be this successful, you would have been called crazy. But being in the hunt the past 5 years, I am starting to notice that they generally are falling to similar teams, granted all very good teams. Teams that play a similar style hockey, but are ultimately just more talented/faster. Yale, QPac, Providence come to mind in the past few years. Lowell has a very workmanlike approach and Norm gets the most out of his players, but I think they do need to bring in more talent to really make that push. They play a rather structured/unexciting game up front so that may stifle recruiting on the offensive side a bit, but it would be nice to see more talented guys come in as those role players and get more scoring depth. Obviously they have been wildly successful, just something I noticed over the past few years.