I have been saying for a while that there needs to be some way to do some sort of single sign on outside of Steem Connect and the Steem Keychain. If someone much smarter than me could find a way to securely use something like the Google single sign on it would remove a huge barrier for a lot of people. There are many sites that allow users to "login with my Google account" and I think having something like that would really increase the number of users. Again, I am not sure how you would handle the security with all of it, but something like that might be beneficial.