I agree that people are ready, in the sense that if they see such cars being pushed by big manufacturers, they'd buy them today. But I think that the vast majority of buyers out there still haven't heard of Tesla, or if they did, they don't see themselves buying their products, at least not today. To get an avalanche, you need the huge mass of mainstream customers out there to do more than just entertain the idea of buying electric. They need to be convinced it's for real, and most people don't feel comfortable to live on the leading edge. They need to be told it's ok to buy this tech, and they unfortunately believe Ford, Toyota, and Daimler over Tesla, as preposterous this situation may seem to hard core EV advocates.
It's a matter of getting both mainstream buyers and mainstream manufacturers in the mindset that this is not just possible or desirable, but inevitable. Manufacturers need to believe buyers will be there, and buyers want to see the cars on dealership lots. They are waiting on each other and we get deadlock.
Tesla doesn't have, and won't have for a long time, the production capacity to accomplish this transition by themselves. They absolutely need the other car makers to make the jump. This is the context in which I see Elon exasperated that something must be done to give other car makers a shove into the future, and that something might be technology sharing.