Are you claiming that based on anything more than wishful thinking? I have a vague memory of seeing a study that found almost the opposite: that the key to innovation is having the relentless skepticism to cull bad ideas quickly.
> this whole site here is thriving because of optimism. smart, intelligent optimism.
This site was notoriously negative (e.g. the famous Dropbox post) in its most successful days, and my subjective impression is that it has declined at the same time as it's grown more optimistic.