Panasonic isn't the only battery manufacturer in the world. Tesla stated it may (will?) partner with multiple companies. (Maxell, Simplo, Desay, LG, Apple, Google?)
Apple would be a logical partner, since $2 Billion or heck, even $5 Billion is a drop in the bucket for it. Apple would directly benefit from a gigantic environmentally friendly battery factory in the United States.
If you are trying to say that this is NOT the end of the Giga-Factory as we came to know it, I totally agree.
However, as much as I hate this fact (hold 400 June 21 contracts that are VERY red now), I think this wavering by Panasonic will drive TSLA down.