I don't believe the Model 3 news changes the fundamental direction of the company, but there is a good chance that it will have a destabilizing effect until the ramp is improving visibly, which I doubt will happen until some time in 2018. And the effects may still linger until Tesla hits 20-25% margins on the Model 3 program, which hopefully it will be able to report by late 2018 or early 2019.
Also, as with the Model X delays, the confidence hit is likely to have ripple effects on other parts of the business -- including confidence in Tesla's ability to ramp the Semi, Solar Roof, Y, FSD, Powerpack/Powerwall, Pickup, etc. It could also aggravate the market's reactions to any early quality problems the Model 3 experiences, which are almost inevitable with a new model. On the other hand, the ramp delay may have a silver lining in terms of allowing Tesla time to address quality issues experienced by employee-owned vehicles before the Model 3 hits high volume production. Finally, it may cause Tesla to slow down major capital outlays on other GFs, which could impact the speed at which Tesla grows, although it will still be expanding at a mind-boggling pace for the foreseeable future.
It was a relief to learn that Powerwall/Powerpack production is not impacted by the pack production issues experienced by the Model 3. Perhaps good news on TE from Puerto Rico, Australia and elsewhere along with the Semi reveal will buffer the effects of the Model 3 news to some extent. But since most investors don't seem to react much to TE news or product announcements it may not have that much of an effect.
The same is true with the Solar Roof ramp beginning next year -- very good news IMO for long-term investors but may get ignored by the market in the short term.
Visible improvements in AP2 are a good sign, but Elon's comments predicting AP2 achieving only human-level FSD performance will probably not be well received (even with the promises of swapping processors if needed for past FSD purchasers). It will be interesting to see what Tesla has up its sleeve in terms of FSD development, but again I think the market will be skeptical until it sees real-world performance.
So IMO the bottom line is Tesla's long term prospects still look as bright as ever. Two or three years from now the Model 3 ramp issues may just be a dim memory. But we could be in for some rough sledding over the next 6-12 months.
On a side note,
@SBenson you were absolutely right that 500K in 2018 was a pipe dream. Whether I was insane or not for believing that was achievable is a judgment I will leave to mental health professionals.