I think duckduckgo often becomes an alternative that isn't an alternative, in the sense yes its there, you are frustrated with Google's behavior and you persist for a whole day and then have to revert back to Google with tail behind legs so it's more of an alternative in name. With the sheer scope of Google properties there is always going to be a tempation for 'value searchers' within the organization to give in to…
To be honest DuckDuckGo is fine, you just need to put a little extra effort in. I'll admit it takes some getting used to but I happily use it now. Also as others have stated the 'sp!' bang is handy.
So it's hopeless then. You're never going to convince anything resembling a sizable portion of the population to put in more effort for no easily appreciable benefit.