There isn't going to be excess 2170 capacity at GF1 for a very long time unless Panasonic starts doing something else...
It's possible this has been discussed already and I've missed it. Has anyone posited how long it may take Tesla to begin producing higher capacity and cheaper cells using the Maxwell dry electrode IP? It seems well established that a good amount of Tesla time and effort went into validating Maxwell's performance claims and scalability. Another Maxwell claim was that dry electrode cells are easier and faster to manufacture. Both suggest that setting up new production lines at GF1 to produce the new cells in volume might be possible in 12 - 18 months rather than 2 to 3 years. Perhaps the first year or more of volume production will go into Semi and ramp with it?
What I really wonder is whether introduction of new cells using Maxwell IP (and additional improvements from Jeff Dahn's group) will be built by Tesla rather than Panasonic. Panasonic, for whatever reasons, has not been able to keep GF1 cell production increasing fast enough to meet all Tesla's needs. If Grohmann could design and build new cell lines from a clean sheet of paper, maybe there would not be enough infringement on Panasonic IP to prevent Tesla taking the next logical step and vertically integrating cell production and pack assembly.