Likely true. The average worker, though, doesn't want exposure to risk. The risk is almost purely downside for the average worker. Even "making tougher decisions faster and earlier" is a pretty shitty deal for a worker, in that they're going to be cast aside on a whim. And startups come with little to no upside risk to compensate for the downside risk (I say this as someone who's been bitten by shitty startup shenanigans).

Probably if Google were broken up we'd see many more and more successful startups, for reasons of funding and talent (and the end of the tendency for Google to make some halting inroad into a niche only to abandon it because of internal politics). That doesn't translate into a better experience for workers though.