Don't confuse power and influence with "being in charge." Big tech companies have power and influence, sure. But to say that "they are in charge" is a wild stretch. And even to say that anyone is "in charge" is a bit misguided. We live in a complex economy, with many interests pulling in many directions - governments, banks, financial companies, tech companies, influence groups, on and on. And even within these subsets, they don't always agree. Banks fight with each other, tech companies fight with each other. There is no monolithic power structure - though there are many powers to be fearful of.
of course the "in charge" is more of a headline grabber than reality but otoh Wall St needs a story to push when selling stocks. w/o people are buying the Nasdaq, the stock pushers make money; when they aren't selling stocks then they don't, at least legitimately. the tech giants are rolling in the printed money and fattening their war chest; look at Apple. in this sense, they are "in charge" and can call some pretty big shots if they want, as in SOPA.
On your other point, about a tech company buying a stake in Gox, I'm sure they will do such a thing when they wish to. There is no need for Tux to pursue these people, and doing so only makes Bitcoin look desperate for attention. Further, it is highly unlike a company like Google would mess around with the grey area legality of the Bitcoin world, at least not openly. It's too much trouble and risk for a large company.
It is small companies, and prescient VC groups, who will run this space for a while.
its not about desperation and i don't think it would be perceived as such. its about a merging of common interests. the REAL economy and the tech giants need something like Bitcoin desperately to prevent being dragged down the black hole by our criminal financial industry and incompetent politicians. its the exact parallel argument for gold except that i think Bitcoin works much better. we as the Bitcoin economy need someone like Google to solidify our existence so that the innovation and investment can continue forward with more confidence.
in time i'm sure this will all fall into place.