In the current state of affairs (i.e. web browser interfaces and mobile phone integration), it's quite inconvenient for people to switch up their search engine regularly, or even use multiple ones regularly.
With say, supermarkets, it's pretty easy to shop at Acme one day, Trader Joes another, and Superfresh the third. Search engines aren't like this, or at least, we haven't figured out a way to use them in a way that is conducive to fast-paced, low-barrier-to-entry (or at least not astronomically expensive barrier to entry) competition. Maybe we should.
That being said, I end up using the DDG results for >50% of my searches. If you do more local searches, or if the things you search for tend to be noisy or obscure then, of course, YMMV.
!yt (youtube) !gmail !news !gg (google groups) !hn !boingboing !torrent !itunes !rubydoc !rubygems !codex !so (stack) !am (amazon) !jstor (and a few other specific academic journal searches, but you can also use !googlescholar) !flickr
and probably a few others! I encourage everyone to check out the list and get it into their workflow. With Alfred + DDG I can get to most things much quicker than I could through google
The reality is that the barrier is very low. Blekko, DDG, bing, yahoo, and we can go back even farther and list more search engines. Nothing is stopping them other than their own engineering resources. Your entire argument is saying Google is better and out innovating the competitors so we should punish them.
Now I'm not saying Google doesn't have a de facto monopoly, but I'm wary of anyone who says a private company should be forced to split. Should they be punished for being the most popular?
I think there could be some questions as to whether Google is engaging in anti-competitive behaviour in the way they use search revenues to undercut other competitors. Perhaps they are doing nothing wrong, perhaps they are doing something wrong, and perhaps an effective remedy to that is to split the company.
To phrase differently and hint at what I am suggesting- if Google provides something that companies cannot live without, what did companies do before there was Google?
http://readwrite.com/2010/02/11/how_google_failed_internet_m...
They didn't.
Smaller companies seem to be replacing the "advertising dept." with "our rank on Google dept.", in which case it's not exactly Google's fault they are dependent on Google, any more than when a Craigslist scraper is dependent on Craigslist.
Web rings and pages of links to other sites were also common, basically what RG did, but more reciprocal.
Also, you can pay for advertising rather than expecting to be entitled to organic results. Nobody forces anyone to build a Google-supported business and frankly, people really shouldn't be doing that for this very reason. It's not a good idea to live at Google's mercy.