Instead of just calling them 1st line, 2nd line, 3rd line, 4th line, why not look at it as having 1A, 1B, 2nd and 3rd lines. The ice time distribution between Carter, Stoll and Richards respectively was 21, 18, 17 and 15 mins per game (rounded up) throughout the playoffs.
If Richards improves his conditioning and fitness level, I could see Sutter sliding him up and giving him more minutes, depending on the situation and what is called for. We saw this adjustment in Game 5 and it worked out perfectly as Richards did a terrific job in picking off passes and forcing the Rangers to reset in their own zone. He thwarted many breakout attempts and kept pinning the Rangers deep in their side of the ice, and he did this when he was bumped up to centering Carter and Pearson while Lewis centered Clifford and Toffoli.
I think it would be very likely to see this alignment up front to start the 2014-15 season (with the assumption that everyone returns):
Gaborik-Kopitar-Brown
Pearson-Carter-Toffoli
King-Richards-Williams
Clifford-Stoll-Lewis
Richards can still produce on a line with King and Williams and can feed passes to those two wingers who are both capable of putting pucks in net. I don't know about the rest of you but Richards' performance in the Finals instilled some confidence in me that this guy can bounce back and find his game next season.