I don't agree that the industry is saying that ideas are worthless. Let's not forget that the "no idea" entry in the last batch of YC funding was experimental, which I am curious to find out what came out of it and what were the results. Also, I think the reason the regular batch of YC funding puts so much emphasis on teams is because it's a good guarantee that the idea will be executed one way or the other. YC gets a lot of entries from people that, at the end of the day, they don't really know or they don't have a history working with them. Dealing with a team of strangers is definitely safer that dealing with a single person.