This is it - the tipping point has finally arrived. This is a killer combination of rapidly falling prices in solar PV (thank you China/Kyoto protocol/Global warming), meeting the falling prices of Li-ion batteries (thank you astonishingly successful decade of laptops/smartphones/tablets), meets a cyclic economic boom (thank you GFC), meets rising gas prices (thank you OPEC/cheap oil/peak oil), meets anti-carbon ince…
You are smart enough to know the risks of having a significant fraction of your net worth in one asset, so I'll spare you the lecture there. Tipping point? No, I don't think so. It's progress, and it's good news, but 30 minutes to recharge is still a LONG time compared to the two minutes a petroleum-fueled vehicle takes, and the best of those can go several multiples of the Teslas range between fuelings.
My tipping point is not a "singular moment" or "lightbulb" - but merely the slow agglomeration over the next decade of multiple convergent waves that just happen to put wind in the sails of the only company able to execute on this plan at this point in time.
Diversification is overrated. When crises happen - all correlations go to one - everything goes down simultaneously. Also my returns are cut in half :D.