There is NOTHING unmanageable about Google. Their management and board are doing just fine, thanks. Breaking up a company for being successful is INSANE. The entire claims appear to be predicated on a wrong understanding of what the law says. Being a monopoly is not, in and of itself illegal. Anti-competitive practices ARE illegal. Google is not, from what I can see, doing anything other than being very good at what they do.
Barriers to entry are limited to having servers and a search algorithm. I can have a web-crawer running tomorrow and a search engine in short order. If I do bette than Google, people will come to me. If I don't, I don't get to whine to the government because I am not competent enough to do a better job!
"Ninety percent of baseball is half mental." -- Yogi Berra