I have yet to understand where you're going with this. If companies inevitably become so powerful that they become governments, then letting the sitting government regulate them is inconsequential; takeover is inevitable! Let's just all eat worms and die!
No. I think the original thinking during the age of reason makes more sense to me. I think that the people truly hold the power, and as long as we don't give up our inalienable rights to governments (in whatever form they exist), and be sure to always question and hold suspect the people we put into the collective positions of power, then we'll be ok.
Don't forget that the limited liability that we give corporations is a government-granted right. That's one of the major reasons we have issues with large companies.
(I'm not going to get into a debate about Coolidge. I think he was a great President, truly the last of his kind — though even he had his moments of growing government.)