Google has gotten so rich, entrenched and popular that IMHO no competitor can dislodge it. I say this as a thoroughly-disappointed user who's tried nearly all the alternatives to Google in the various segments that it operates in. I've managed to stop using nearly all Google services except Android (running CM) and Search.
As others have pointed out in the thread, DDG is nowhere near as good, especially if you're not in the US (I'm in India). After having forced myself to use DDG for a month, I've now resigned myself to Google searches with a couple of extra steps: - all searches performed while logged out of all Google services - browser plugins to rewrite all Google tracking URLs from search results
So sure, we need viable search engine competition. But don't wait up for it either.