Every word of this.
That said, I do think Tesla will start out GF3 with purchased cells, on short-term contracts. But I've been saying for a long time that they'll cut out Panasonic out of future products the very first chance that they get. And that chance may be coming sooner than I expected. I don't see them necessarily forcing Panasonic out for existing purchase agreements (at least in the near to mid term), for capital reasons - I just see them not getting picked up for future supply needs, once Tesla feels that it's in a position to make its own cells.
Tesla's ultimate objective is to own giant factories that buy only raw materials (in mass quantities), produce only finished products (at lightning speed), and retain all of the profit therein for themselves. Sharing is not in their nature.
Who wants to wager a bet that Grohmann has been working on cylindrical cell lines?
Also lets not forget Panasonic is making deals with all other automakers, can potentially have more bargaining power in a cell limited world against Tesla.
Toyota and Panasonic Form Joint Venture to Make EV Batteries