..when we started seeing how lithium-ion powered cars were performing vs fuel cell vehicles, and doing the math on their relative efficiency.
As for Toyota, I think their fallout with A123 Systems (re: the latter's battery patent) defined not just Toyota's but the Japanese attitude in general toward BEVs. There seemed to be a reckoning over there that they just weren't going to be able to compete with the US or China on battery tech. I even think this pro-H2/anti-battery mood contributed toward the ouster of Nissan's CEO, Carlos Ghosn, who brought the Leaf BEV to market.
As someone who has long championed BEVs as superior, I feel somewhat vindicated in reading about Toyota's FCEV flop, especially when people cite long refueling times (a weakness of BEVs). But I will also say that I thought BEV "fast charge" was a dead end and that the future would be swap-able battery packs allowing "re-fueling" in just a few minutes. I still think that makes sense for the future, and I can see how car mfgs would start supporting swap-able "booster" packs which could eventually lead to cars that use 100% swap-able batteries. Otherwise, the Chinese model for battery swap might also take hold. Finally, I think swap-able batteries call for an industry 'surplus' of battery stock that would be queued for re-charging at optimal time-of-day at refueling stations... this would act as a big enabler for intermittent renewable energy (over and above what V2G provides) as consumers would feel less pressure to plan the charging of their cars at certain times of day (and less pressure to find charge points and keep their cars attached to the grid).