Time recently came out with a new article called Search And Destroy which I did not enjoy.
In my eyes it was apparent the writers knew nothing about search. Listed are a couple quotes which show what I am talking about.
"Should they be allowed to push the websites of their own businesses to the top of the stack? Could a search engine suppress the website of a political party with which its CEO disagreed?"
If it was know that this was happening people would quit using the search engine. Politics are frequently fed by greedy companies who can afford to waste money anyway...as noted on this very site yesterday. The largest drug companies have already started to control ads anyway.
"But when the competition gets stiff and Page has to answer to his shareholders, integrity may be a luxury Google can no longer afford."
I certainly think it will be hard to balance, but there is no way that going public will imediately cause them to loose all of their business ideals which made them a success.