What happens to the assets of the dead Google? Will regulators actually let FAAN take over broad swaths of it? Not likely. It's much more likely that regional or smaller businesses will enter the vaccuum. Similarly but from the consumer side, I already know for many of these, there are already viable alternatives that would easily scale with demand.

Even further, if your business is coupled entirely to the continued existence of a single corporation, or if the totality of your economy is entirely coupled to the continued existence of a single corporation, we have a word for that: a monopoly. As far as I know, permitting the existence of monopolies is broadly agreed upon by experts to be a bad idea for many reasons, the least of which is the stifling of viable alternatives. The most severe is that it threatens the legitimacy of the entire government through regulatory capture and, at root, there is no organization that I think is actually "too big to fail" except the actual government.

Breaking up Google creates short-term disruptions and penalizes those that let the market even get to the point that the FTC and DOJ needed to intervene (I'm looking at you Mozilla). Everyone, including those now dependent on Google, is benefited in the longterm.