Elon seemed really happy and confident about it... before the battery factory seemed like an albatross.
I think google (or Larry Page individually) is possible. Batteries may be a massive business in the coming decades. If EVs completely replaced ICE, it would take 200 of these Giga Factories. Page wants to see these changes happen. According to Steve Jurveston, Page has told him he sometimes thinks the best thing he could do with his money would be to leave it to Elon. I think Page meant when he dies- perhaps some of the money could come under Elon's stewardship sooner (think Warren Buffett putting money in Bill Gates stewardship). When Jurveston asked Page why he said (according to Jurveston) because Elon is doing the things I want to see done.
I know this may sound crazy, but Elon seemed to be looking forward to sharing the plan and getting it going. He didn't seem that way at all on the last earnings call.